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Many other combinations of large and small drop point blades, a Phillips-head screwdriver, saw, etc. Elongated knife, with a single narrow clip point blade.
Handle has bolsters at both ends, and is turned up or tapered on the opposite end of the blade.
but were not widely available until the arrival of the Industrial Revolution and the development of machinery capable of mass production.
Most locking knives have only one blade that is as large as can be fitted into the handle, because the locking mechanism relies on the spring along the back of the blade to lock it and it is difficult to build in multiple levers, one for each 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.
Gillette is one manufacturer for whom we have information on serial numbers and later date of manufacture codes that we can link to time.
Razor Serial Numbers were impressed on all Gillette razors from 1904 until 1921, and on deluxe models from 1921 until 1931 (except for a period in 1927-28).
If anyone has further information please let us know.
A recent offering from Camillus Cutlery are the tried and true military knives coated in a Desert Tan epoxy coating.