Gillette aristocrat dating
Some razors get date codes (Letter for the year and a number 1, 2, 3 or 4 for the quarter of that year).
This corresponds to the time King Gillette was directly associated with the business, and may have been at his insistence.
This page documents what we know about Gillette safety razor serial numbers and date codes.
Razors made in USA often left the factory with serial numbers or date codes, which can be used to establish their manufacturing dates.
The "red dot Fat Boy" is considered by many to be a prototype but it was sold at retail with a warranty card. Also first year of the 9-settings "Gillette Adjustable" aka "Toggle" in the long blue plastic case. TV Special flare-tip Super Speed in red plastic case with clear "TV" marked lid this year only.
Nickel-plated "Gillette Adjustable" aka "Toggle" this year only.