If I remember correctly (and I may not), the first use of Marcas Registradas was on ".357" Magnum, Reg. Number 2517, shipped on August 9, 1937 to Roberto A. Gonzales, Mexico City. It was roll marked on the side plate. This Magnum has a 8 1/4-inch barrel and is the only one shipped with Tuskoid stocks.
Bill
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