The presence of clear labels indicating contents were first used around the 1950s.These are either on the front, back or base of your bottle.By 1970, cosmetic companies were stamping colored numbers on the bottom of their products.

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Older bottles from the 1930s-40s would have lot numbers or patent numbers embossed right into the glass base.

A Zip Code on a label denotes age meaning this bottle is from 1962 or later. From 1937 to 1962, two code numbers were used on mail and labels.

In 1962, all zip codes were required by the US Postal Service.

If your bottle has a label which states: "returning this bottle to the perfumer is a national duty"..your bottle dates from 1940-1945 during World War II.

Bottles embossed with or having labels marked "Made in Occupied Japan" were made from September 1945 until April 1952.

Bakelite screw caps were in usage from 1930s-1950s.Some perfume bottles as the ones for Lanvin often continued using black Bakelite screw caps into the 1960s.Do you have a vintage perfume and need help in figuring out how old it may be?Simply knowing when your perfume first came out can be a huge help.I have written over 270 guides on e Bay and over 400 guides on this site about perfume companies and their perfumes and noting launch dates for perfumes.Please remember that some perfumes were made for many years after their launch dates, on the other hand, some perfumes were only sold for a very short time.