M-3335 THOMAS S 615

By Mason Colby; posted October 30, 2015

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Incuse on the underside of second skirt. I see that S 415 has been reported.

Paul Greaves replied: "The 615 is a date code (June 1915) and the S is some sort of shop or trimmer mark. (There is still debate on the meaning of those marks as far as I know.) Various other symbols and geometric designs are known."

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