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Millions of key blanks have been manufactured & Chrysler used the same 1969 version for almost a couple of decades - like everything else over the years - quality has changed.

I believe the "A", "B", "other?" stamped on the OEM "Chrysler" branded keys is the manufacturer: "B" = Briggs & Stratton.

Very interesting,rumor has it that B/S made way more money on car keys in the 60s than they ever did on small engines!