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This was done at the factory when the stopper would have been ground to fit the bottle, the numbers are to show which bottle goes with the right stopper.
These were usually found on French bottles such as Baccarat.
Older bottles from the 1930s-40s would have lot numbers, bottle shape numbers or patent numbers embossed right into the glass base.
By 1970, cosmetic companies were stamping colored numbers on the bottom of their products.
This stamping usually consisted of four numbers and was visible on the bottom of each item and is a "batch code", which is used by the company to note what year and month the product was created.
Batch codes are often found either stamped on the glass or the label.
Bottles embossed with or having labels marked "Made in Occupied Japan" were made from September 1945 until April 1952.
Enameled lettering, also known as serigraphy (instead of labels), on glass bottles started being used after the 1930s and was pretty regular feature in the 1940s onward.
Sample bottles from the 1950s onward, often had labels that would say "sample, not to be sold". Factice, or display bottles, were not meant for resale, and will have labels such as: "dummy, not for sale".
Sometimes a date is also stamped on the backside of the label, I have seen this with old Chanel and Lanvin bottles.
Chanel bottles from the 1960s onward should have the backs of their labels marked with a copyright symbol and CC.
Also, English Registry Design numbers can also be found on perfume bottles from the United Kingdom, you can search the numbers online also.
Old glass bottles might have etched matching numbers on the base of the perfume bottle and on the bottom of the stopper.