What do bottle bottom numbers mean?

They can be mold numbers, plant codes, date codes, capacity marks, design numbers, or inventory marks. They must be read with the bottle shape, seams, lip, and context.

Can a bottom number alone date a bottle?

Usually no. Some manufacturer systems include date codes, but many numbers are not dates. Use them as one clue, not a conclusion.

What photos help identify bottom numbers?

Photograph the entire base straight on, then close-ups from angled light so embossed or debossed numbers are readable.

Updated May 4, 2026

How to identify bottle bottom numbers

Bottle bottom numbers can help identify maker, mold, plant, capacity, or date system, but they rarely prove age or value by themselves.

Generated editorial support image, not an auction lot. Base numbers need context from the whole bottle.

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Quick identification checklist

Photograph the entire base, not just the number.
Record all numbers, letters, symbols, dots, mold seams, capacity marks, and maker marks.
Compare the base clue with the lip, closure, embossing, and bottle type before dating it.

Key value drivers

Bottom numbers matter when they confirm a scarce maker, period, plant, or bottle type. They do not automatically make a bottle rare, and many are ordinary mold or factory control numbers.

Auction evidence from Appraisily's database

These records are market examples, not final appraisals. They show bottle categories where base photos and marks can support identification.

Photo	Category	Sale	Date	Lot	Realized	What it shows
	Soda bottles	Ripley Auctions	Dec. 30, 2025	Lot of 4 vintage glass bottles, Coca-Cola and Moxie	USD 10	Base and size details help separate common bottles.
No lot image	Medicine bottles	Meander Auctions	Apr. 18, 2026	Collection of medicine bottles	USD 70	Base marks need to be read with shape and use.
No lot image	Mason jars	Ripley Auctions	Apr. 1, 2026	Vintage blue Ball glass mason jars	USD 30	Jar bases and embossing need full context.

Condition and authenticity cautions

A number can be misread, worn, or unrelated to date. Artificial color, reproduction embossing, reused lids, and common factory codes can all create false confidence.

Photo checklist

Base straight on, base at an angle, whole bottle, lip, seams, label, closure, and scale reference.
Close-ups of every number, letter, symbol, dot, heel mark, mold seam, and damage near the base.

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