Probably paid too much for these up this morning at our local flea market. However, they had no model number... serial number with 4 line address: "Made in USA, Marcas Registrada, Smith & Wesson, Springfield, Mass" and a "Patent Pending" stamp. Look to me like the earlier model 100 without model marks. Early 1950's? Thanks for any insight. (Note: blackjack in background found at same flea market a few months ago and is shown in the 1951 Federal Laboratories catalog.)