How to identify old glass marks
Identify old glass marks by checking the base, heel, pontil, molded symbols, maker marks, etched signatures, labels, and the full object type before making a value call.
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Use the free screenerStart an appraisalQuick identification checklist
- Photograph the mark and the full object. A mark without form can be misleading.
- Check base, heel, pontil, seam, label, stopper, rim, etched signature, molded symbols, and numbers.
- Separate bottles, jars, table glass, art glass, perfume bottles, and bottle vases before comparing marks.
Key value drivers
Marks matter when they connect the glass to a maker, period, line, or method. The mark is only useful if condition, authenticity, rarity, and object category also support the claim.
Auction evidence from Appraisily's database
These records are market examples, not final appraisals. They show glass objects where marks, form, color, and category need to be read together.
| Photo | Category | Sale | Date | Lot | Realized | What it shows |
|---|---|---|---|---|---|---|
| No lot image | Marked art glass perfume bottle | Moorabool Auctions | May 2, 2026 | Moser uranium glass perfume bottle and stopper | AUD 275 | Maker attribution and stopper matter. |
 | Apothecary glass | Lion and Unicorn | Mar. 22, 2026 | 5pc French cobalt blue glass apothecary bottles | USD 375 | Marks must be read with use and color. |
 | 19th-century amber bottles | Eldred's | Jan. 29, 2026 | Four amber glass bottles, 19th Century | USD 800 | Age, form, and condition can carry more weight than one mark. |
Condition and authenticity cautions
Marks can be copied, misread, worn, polished out, or unrelated to the final seller. Chips, cracks, sick glass, altered color, fake signatures, and replaced stoppers can change value materially.
Photo checklist
- Full object, base, mark, heel, pontil, seam, rim, stopper, label, color, and scale reference.
- Close-ups in angled light of molded marks, etched signatures, numbers, symbols, damage, repair, and residue.
Related guides
Collectibles guides, old glass bottles identification, old glass bottle identification, bottle bottom numbers, free glass appraisal app, value of old blue glass bottles.
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