If you have the key to another manufacturer's codes, please share this information with other collectors. No razors got date codes or date serial numbers until 1950 except only De Luxe model razors which still got serial numbers this year only.
These serial numbers were on the top of the guard, or sometimes the inner barrel.
There were no razor serial numbers from 1931 until 1950.
Razor Date Codes began in 1950 and used the same system blades had used since 1930, a code that identified the year and calendar quarter of manufacture.
These codes are found on the underside of the guard mechanism, or in cartridge razors, near the attachment mechanism for the blade.
Gillette Blade Date Codes (and earlier lot systems) were imprinted on one side of the blade as a series of letters and/ or numbers, or on the cartridge.
The blade system adopted in 1930 is still in use today, and was used on razors as well after 1950. Other makers included serial or manufacturing codes, but we do not have the keys.
Auto Strop and Rolls are two well known manufacturers who serial numbered their razors.
Dating Gillette Razors and Blades: "How old is this razor? Sometimes patent dates are a help, but they give you the front end of the date scale, and not always too exactly.
Some razor makers put serial numbers on their razors, but we don't always have the key to how the serial numbers fit to dates of manufacture.