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Nickel-plated "Gillette Adjustable" aka "Toggle" this year only.Also last year of the 9-settings "Gillette Adjustable" aka "Toggle" in the long blue plastic case. Also only year of the 9-settings "Gillette Adjustable" aka "bottom-dial Fat Boy" which some consider to be a prototype.Also first year of the "Gillette Adjustable" aka "Fat Boy" aka "red dot Fat Boy".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.
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.
This corresponds to the time King Gillette was directly associated with the business, and may have been at his insistence.
These serial numbers were on the top of the guard, or sometimes the inner barrel.
Known specimen has a serial number of 2605 instead of a letter/number date code.
It also has a red dot on the neck near the adjuster ring and a red dot on the toggle switch. It was dated by the date code of 'B 1' on the included blades.
Gillette is one manufacturer for whom we have information on serial numbers and later date of manufacture codes that we can link to time.