The shotgun in question was made in late '47 or early in '48. It was actually made by High-Standard. Their version of this shotgun was called the Mod. 200. High Standard sold no shotguns at the time the 583.53 was made - probably in the late 1940's The High Standard model 200 was a late 1960's model but did have a few common parrts with many of the models 20's and 21's http://www.histandard.info/PDF/Sears%20Shotguns.pdf