Congrats on bringing that one home. High Standard began assigning model numbers to the Supermatic model in 1954 with the introduction of the 101 series, that's what you have. This is the first model with the push button barrel takedown feature which would remain until the end of the company in 1984. They did not start naming the models until the 102 series in 1957. The 102 series had various named models including Trophy, Citation, Tournament, Flite King and Sport King. The Supermatic name stayed, the series number and model name were added, so you might see a Supermatic model 102 Citation for example. At some point along the way the Supermatic name may have disappeared, I don't recall. The named models stayed until the end of the company. Like S&W the High Standard .22 pistol rabbit hole is wide and deep, lot's of variations to collect. Their is a member here I believe, John Stimson that can tell you anything you want to know about these great pistols, maybe he will chime in here. As another poster mentioned, Rimfire Central is also a great place to learn about them. It's best to stay with standard velocity ammo as the frames were of a relatively soft steel and may crack if subjected to a steady diet of high velocity rounds. I've not experienced a cracked frame but something to be aware of.
