OK. I found some slightly abused mil-surps. British 455s. I would like the years of manufacture for a S&W 455 New Century Ser. # 361XX. The second is a M17 MKII 455 Ser. # 683XX.
The year of manufacture for serial number 683 is 1917.
December
U.S. government contract Smith & Wesson 1917 revolvers had serial numbers between 1 and 175100, they should have U.S. property markings on the bottom of the barrel and U.S. army marking on the bottom of the butt. After the war S&W 1917 revolvers were sold commercially and also to the Brazilian government. Brazilian contract revolvers have the Brazilian seal stamped on the side plate.