An underlined N inside a circle points to Northwood carnival glass, but the mark alone cannot authenticate or date a piece; check the pattern and shape too.
Some Northwood pieces are unmarked, and later reproductions can carry an N-like mark. This guide helps you record the evidence and choose the next check; it does not identify an individual bowl from a description. For colour, iridescence and care questions that apply to carnival glass from any maker, see our carnival glass identification guide.
What your mark can tell you
Northwood’s own mark is a moulded capital N, underlined, inside a circle. The Kent State University Museum’s exhibition notes on the first decade of carnival glass describe it as “an underlined capital N within a circle” and record that the Northwood firm introduced its iridescent glass in 1908 and ceased operations for good in late 1925. Glen and Stephen Thistlewood’s survey of makers’ marks on classic carnival documents several later N-like marks used by other makers that have misled collectors. The table sets the documented forms side by side.
| What you can see | What the references document | What to do next |
|---|---|---|
| A moulded, underlined N inside a complete circle | Northwood’s mark, used on much but not all of the company’s carnival glass between 1908 and 1925 | Compare it with photographed marks, then check the complete pattern and shape. The letter alone neither dates nor authenticates the piece. |
| An N with a wobbly outline, an extra tail or a stroke that turns it into a crooked W | The Thistlewoods sketch a “wonky” N used c. 1970s on items made for L.G. Wright; Doty describes Wright’s modified mark as a small tail on the left bar of the N | Treat the piece as possible Revival-era production and compare Wright’s catalogue patterns before Northwood’s. |
| An N inside a circle that does not close | Documented by the Thistlewoods on some pastel Grape Delight nut bowls and on Grape and Cable butters that Mosser made c. 1970s | Compare Mosser and Wright examples; keep the attribution open. |
| A heavy, thick N with no circle and no underline | Described on Far East fakes of Grape and Cable, Good Luck and Peacocks bowls | Work through the pattern-specific tells on the Thistlewoods’ Northwood fakes page before trusting anything else about the piece. |
| A clear W with an underline that curves up at the ends | Doty records this as L.G. Wright’s later mark | Not a Northwood mark; research the piece as Wright glass. |
| No readable mark | Not all Northwood carnival was marked, and Fenton, Millersburg and Westmoreland did not mark their classic carnival at all | Start with the pattern and form. A missing mark does not settle the maker either way. |
| Only a seller’s photograph of the N | A close-up cannot show the pattern layout, base or condition | Request views of the entire object and its underside before making a decision. |
David Doty’s photographed maker-mark guide places original and later examples on the same page. Use those photographs for comparison; a typed letter or generated drawing cannot reproduce the small differences in a molded mark.
Read the whole object, not just the letter
Record the letter, any line beneath it, the surrounding outline and any additional strokes. The Thistlewoods note that Northwood’s mark is often, though not exclusively, placed on the inside of the piece and is sometimes so lightly moulded that the underline or circle is easy to miss, so check the interior under angled light before writing that either element is absent. If glare hides a detail, write “unclear” rather than completing the mark from memory. Rotate the object only if it can be handled safely, and take another photograph with the light coming from a different direction. The same care applies to any moulded glass mark; our visual dictionary of antique glass identification marks explains how pontil scars, mould seams and embossed marks are examined.</p>
Next, describe the object independently of the seller’s attribution: bowl or dish, rim shape, feet or base, handles, and the arrangement of the decoration. “Grapes” is a starting observation; it is not a complete pattern identification. Compare the layout of the design on both surfaces rather than matching a single attractive detail. If you are not yet certain the piece is carnival glass at all, our broader guide to antique glass marks helps place it among art, pressed and pattern glass before you narrow the search to Northwood.</p>
Doty notes that marking varies both between Northwood patterns and among examples of some patterns. That is why no mark and not Northwood are different conclusions. It is also why finding the expected letter should begin the comparison instead of ending it.
Documented reproductions and fakes worth checking
The following cases explain why an N-like mark needs context. They are comparison leads drawn from the linked references, not a complete list of every later pressing or copy.
Grape Delight. Glen and Stephen Thistlewood document the pattern as Dugan-Diamond and show later L.G. Wright catalogue examples. Their research describes reproductions with Northwood-like marks and warns that a flared rim is not exclusive to the earlier pieces. A maker name inferred from the letter can therefore conflict with the pattern’s history. Grape Delight research and catalogue illustrations.
Stork and Rushes. Doty’s reproduction entry describes later Wright pieces bearing the Northwood N even though the original pattern was Dugan’s. It also describes a modified mark resembling a crooked W. Check the exact form you are comparing; the existence of an old pattern does not make every later example old. Stork and Rushes reproduction reference.
Grape and Cable and other copied patterns. The Thistlewoods illustrate examples with a large, plain N and discuss the survival of older marks in later production. Their observations describe particular examples, not a rule that every reproduction has the same mark. A neat-looking circle is not enough to dismiss the rest of the evidence. Reissues, reproductions and fakes.
That same reference rejects the shortcut “old glass is satin-like; newer glass is shiny.” Some earlier carnival glass was deliberately very shiny. Treat the finish as something to document, not a standalone age test.
Far East fakes of Good Luck, Peacocks and Grape and Cable. The Thistlewoods’ Northwood fakes page lists Good Luck, Peacocks, Grape and Cable bowls and hatpin holders, and Memphis covered butters as patterns that have been faked, and considers it likely that the fakes come from the same unknown source in the Far East. On the Grape and Cable copies they describe a large-looking N that is cruder than the genuine mark and is neither underlined nor in a circle. The same page gives pattern-specific tells, such as grapes of uniform size where the originals shrink toward the centre; use those checks rather than the letter.
The mark after Northwood. Doty records that the American Carnival Glass Association filed suit and Wright was prohibited from using the Northwood mark. The USPTO register entry for serial 72335114 shows that the association filed an N design mark, drawn with concentric circles and a horizontal bar, for glassware in August 1969 and registered it in November 1970; the registration was cancelled in January 2016 because no Section 8 declaration was filed. Northwood itself ceased operations in late 1925, so an N applied to glass after that date was put there by a later owner or copier of the mark, never by Northwood. A convincing moulded mark on later glass is not a Northwood-only problem; our Heisey Diamond H mark guide describes how another firm’s original moulds, trademark included, were pressed by a later company after the factory closed.</p>
Make a comparison record before buying
Use this short sequence to keep observations separate from conclusions:
- Photograph the whole piece. Include the front, back or underside, rim and base. Keep the original files so the full object remains available beside any cropped detail.
- Add a close view of the mark. Take more than one lighting angle. Avoid filters or sharpening that redraws a faint stroke; a clear “unreadable” detail is more useful than a convincing invented one.
- Record the dimensions and condition. Note where each measurement was taken. Photograph a chip, crack or suspected repair separately instead of letting it disappear into the overall view.
- Save the exact reference. Record its URL, pattern name and illustrated shape. Ask whether it shows the same form, rather than a different object with a similar motif.
- Write the remaining question. For example: “The pattern looks similar, but the underside and mark are not yet matched.” This is a useful result, not a reason to force a maker attribution.
This is an editorial recording workflow, not a scoring system. No number of matching boxes proves authenticity. If the pattern and mark disagree, keep the disagreement in the record and ask a carnival-glass specialist to review the photographs or examine the piece.
Before assigning a date or value
Do not turn a maker’s initial into an exact production year or a price. A genuine Northwood mark places a piece, at best, within the company’s iridescent production between 1908 and its closure in late 1925; the mark itself does not narrow the year, and because N-like marks were applied to other makers’ glass decades later, the letter alone does not even establish that span. Establish the likely pattern and version first. On value, Doty’s maker-mark guide states that the absence or presence of the mark makes little difference in the value or desirability of a piece, so do not price the letter itself. When comparing sale records, keep shape, size, colour, condition and the sale date alongside the result; an asking price is not evidence that a buyer paid it.
An honest provisional description can be more useful than a confident mistake: “Iridescent glass bowl, pattern attribution unconfirmed; underside photographs available.” When a specialist or a stronger reference resolves the uncertainty, update the description with that evidence.
Method and limits: This guide is based on the linked collector references, the Kent State University Museum’s exhibition notes and the USPTO trademark register. No physical Northwood specimen was examined for this article. It provides an inspection record and documented examples of misleading marks, not an appraisal, a complete mark catalogue or an individual authentication.
