An online furniture valuation is only as good as your photos: age shows in joints, saw marks and nails, and value comes from comparable sold pieces.
This guide explains which parts of a chest, table or chair carry the dating evidence, how a price is built from sales of similar pieces, and which online route suits which kind of piece. It describes published sources; no furniture was examined in hand for it.
What an online furniture valuation can tell you
From photographs alone, an online valuation can suggest what a piece is, roughly when it was made and which sold pieces it resembles; it cannot confirm its age, its originality or the repairs you did not photograph. That limit applies to every service, human or automated. Bob Flexner, author of several books on wood finishing, writing on how drawers date furniture for Popular Woodworking, puts the principle plainly: “Seldom does one clue provide confirmation of anything.”
The person sending the photographs therefore controls much of the accuracy. A front view shows style, and style is the easiest feature to copy. The joints, the underside of a drawer and the back boards carry the dating evidence, and a valuation that never sees them is pricing a guess. Our complete guide to identifying antique furniture by era and style shows how the construction and style evidence fit together before any price enters the picture.
Age comes from construction, not looks
Construction dates a piece more reliably than its looks, because tools and machines changed in a known order and left marks where few people bother to look. Drawers are the quickest place to start. Flexner describes three joints used on quality drawers, and each one points to a different period.
Hand-cut dovetails are the oldest. According to Flexner, “The size of the pins and tails is typically uneven, with the pins commonly narrower than the tails”, and “clearly visible scribe marks and saw or chisel overcuts frequently remain on the wood.” The pin-and-scallop joint, a row of round pins in scalloped drawer sides, was the first machine drawer joint; Flexner records that it was “patented by Charles B. Knapp in 1867” and that “The pin-and-scallop joint was used from the early 1870s to the end of the 19th century.” Machine-cut dovetails came last: “Machine-cut dovetails are identifiable by their perfect symmetry”, and “The machine that cuts these joints came into use in about 1895.” Our 1800s dresser guide shows each joint in more detail.
Saw marks and nails add two more clues. The Ledyard Up-Down Sawmill’s guide to saw marks explains that boards from an up-and-down sash mill have straight marks at a right angle to the length of the board, while boards sawn on a circular sawmill show “the curved marks expected from a round saw blade.” Nails changed too: Wikipedia’s history of the nail gives overlapping eras for the “Cut nail (roughly 1800 to 1914) Wire nail (roughly 1860 to the present)”. Our guide to dating furniture by hardware covers nails, screws and hinges one by one.
| Clue | Where to photograph it | What it suggests | Caution |
|---|---|---|---|
| Hand-cut dovetails | Drawer side where it meets the front, and the inside corner | Uneven pins and tails, scribe lines and overcuts | Still cut by hand today, so they do not prove age on their own |
| Pin-and-scallop joint | The same drawer corner | Not older than the early 1870s | A 19th-century machine joint; dates run later on European furniture |
| Machine-cut dovetails | The same drawer corner | Not older than about 1895 | Router jigs cut the same joint today |
| Drawer bottom | Underside of a pulled-out drawer | A thick panel bevelled on three edges is older than a plywood one | Some factories made their own plywood before the 1910s |
| Saw marks | Back boards and drawer bottoms | Straight, even marks from a sash mill; curved marks from a circular mill | Mill types overlapped by decades |
| Nails | Back boards, drawer bottoms and glue blocks | Cut nails roughly 1800 to 1914; wire nails roughly 1860 onwards | A later repair can add later nails |
Every row works mainly in one direction. Flexner warns that “many clues aid only in establishing that the furniture” is not older than a certain date, and the Ledyard guide cautions that dating a board by its saw marks “needs to be done with great caution since periods in which different types of sawmills were used overlap by many decades”. Place of manufacture shifts the dates as well: Flexner notes that “machinery entered factories in Europe much later than in the United States, so all dates need to be pushed forward on European furniture.”
What the secondary wood and plywood tell you
The secondary wood, the timber used for drawer sides, bottoms and backs, is often more useful to an online reviewer than the show wood on the front. Flexner observes that “Before the mid-20th century, oak was often used in Europe for drawer sides and bottoms, while pine, poplar, cottonwood or some other ‘white’ wood was commonly used in America.” A clear photograph of a drawer side can therefore suggest where a piece was made, which in turn changes which sales it should be compared with.
Plywood needs more care than the old rule of thumb allows. Laminated wood is not proof of a modern date: Wikipedia’s article on plywood records that industrial use began in the 1850s, “most commonly as a moulded material used in furniture”, and notes that “John Henry Belter was a pioneer of this, patenting a technique for the production of chair backs in 1858.” What changed later was the flat manufactured sheet. Flexner writes that “By the 1910s manufactured plywood was available and it quickly replaced solid wood as the drawer bottom material of choice”, while cautioning that “A few factories were making their own plywood panels before this date”.
So a plywood drawer bottom in a chest described as 1850s work is a reason to look closer, not an instant verdict. It may be a replacement, the attribution may be wrong, or the piece may be a later reproduction. Earlier drawer bottoms, Flexner explains, “are typically thicker and are beveled on three edges” to fit the grooves, and those bevels show up clearly in a photograph taken under the drawer.
Style and wear support a date but do not prove it
Style and wear place a piece in a period only when the construction agrees with them, because both can be reproduced. Flexner lists style, finish, tool marks, “areas of wear and general appearance” among the clues worth reading, and adds a warning that applies to all of them: “Any technique or machine that was once used could still be used”. Reproduction makers still use the old methods, so a period look, and even period techniques, can appear on a much later piece.
That is why a style name on its own should not set a price. A table described by a style name can be a period original or a much later piece in the same taste, and only the construction separates the two. Our period guide to antique furniture styles sets out the forms and dates of each style, the guide to Duncan Phyfe originals and reproductions works through a single maker in detail, and how to date an antique chair by its leg style covers the part of a chair that changed most often.
Wear is supporting evidence in the same way. Look for it where hands, feet and drawers actually rub: the front edge of a top, around handles, on stretchers and feet, and along the runners under each drawer. Wear that follows how the piece was used is consistent with age; wear in places that no one touches is a reason to look for other explanations. Either way, photograph it, because the reviewer cannot weigh what they cannot see.
How furniture value is actually set
A furniture value is set by what comparable pieces have actually sold for, not by the style name or the original price. The IRS guidance on valuing donated property gives the standard definition: “FMV is the price that property would sell for on the open market.” It adds that “The sales prices of properties similar to the donated property are often important in determining the FMV”, and that “The weight to be given to each sale depends on the following”: how similar the pieces are, how recent the sale was, whether it was at arm’s length, and whether it happened in the same market area.
Those four tests are a useful way to judge any online valuation. A comparable that is a different form, a different wood, a different country or a sale from many years ago is weak evidence, and an asking price is weaker still, because it records what a seller hoped for. The IRS gives weight to an offer only “if the person making the offer was willing and able to complete the transaction”. Condition matters as much as identity: the same guidance states that “The physical condition and extent of restoration are both relevant in determining the valuation of art and antiques”, and our guide to restoring or preserving antique furniture explains why an original surface is usually the one to keep.
The date also decides which market a piece belongs to. The IRS observes that “The FMV of used household items is usually much lower than the price paid when new”, that such property “may have little or no market value because it may be out of style”, and that household items do not include antiques. A chest that turns out to be a later reproduction is priced as used furniture, not as a period piece. Our guide to how to tell if your antique is worth money lists the signs that lift a piece out of that category, and how appraisers determine antique value explains which value a written report commits to.
Which online valuation route fits your piece
Pick the online route by what the number has to do: an app for a quick identification, an auction house estimate if you may sell a good piece, and a written appraisal when an insurer, executor or tax authority will rely on the figure. Our overview of online antique valuation tools compares the archives and services in more detail.
A photo identification app is the fastest first step. This site publishes one, Antique Identifier - Antiqly, which is free to download with in-app purchases on the App Store and on Google Play, runs on iPhone and Android, and needs no sign-up. We did not test it against furniture of known date or value for this article, so treat its answer, or any app’s, as a lead to check against the construction clues above. Our article on whether a free antique valuation app actually works sets out what such apps can and cannot do.
An auction house estimate suits a piece you might consign. Christie’s selling guide, for example, invites sellers to “Use our online request form or contact us for expert valuations”, and states that “Estimates are provided in 3–4 weeks for items for which Christie’s has a category of sale and which meet our minimum consignment value.” An estimate of that kind is a view on the likely auction result, not a formal appraisal, and a piece below a major house’s threshold will not get one, so a regional auctioneer may be the better first call.
A written appraisal is the route when someone else will rely on the figure. The American Society of Appraisers directory says the society “has thousands of designated appraisal professionals throughout the world”, and in the United States the IRS states that “Many, but not all, charitable contributions require a qualified appraisal completed by a qualified appraiser”.
The photos to take before you ask for a valuation
Take these photographs in daylight before you contact any service, because they are all an online reviewer will ever see of the piece:
- The whole piece from the front, both sides and the back, with a tape measure or the dimensions noted.
- A drawer pulled out, with the side joint shot straight on and again at the inside corner.
- The underside of that drawer, showing the bottom panel, its edges and any saw marks.
- The back boards, the underside of a top or seat, and any glue blocks, with nail and screw heads sharp enough to read.
- Every label, stamp or stencil, as close as your camera allows; our guide to the maker’s mark on furniture shows where to look.
- Every repair, crack, replaced handle, veneer loss and area of wear.
What to do with your piece now
Work through these three steps and stop as soon as the answer is good enough for what you need.
- Photograph the evidence, not only the front. Take the six shots above, so that whoever looks at the piece can see its joints, drawer bottoms, back boards, marks and damage.
- Date it before you price it. Check the drawer joints, drawer bottom, saw marks and nails against the table above, and treat each clue as a limit on the earliest possible date rather than as proof of age.
- Price it from sold comparables, then decide who the number is for. Look for completed sales of the same form, wood, origin and condition; if an insurer, executor or tax authority will rely on the figure, book a qualified appraiser and bring your photographs.
Method and limits. This article draws on Bob Flexner’s drawer-dating guide, the Ledyard sawmill’s saw-mark guide, Wikipedia’s histories of nails and plywood, IRS Publication 561, Christie’s selling guide, the American Society of Appraisers directory and the two app store listings linked above. No furniture was examined in hand, no app or valuation service was tested, and every date given is a guide that can shift for European pieces, repairs and reproductions.
