Gold plating kind of went out of style in the 1930's, although it might even still be an option with Selmer. Of course a shiny lacquered brass sax might be mistaken for gold plate. If you see silver under the gold in worn places, it might actually be gold plate. When you get the serial number you can scheck it's vintage on the Selmer website : www.selmer.com I would guess this is going to be a Super Sax or Cigar Cutter from the late 1920's or early 1930's, In nice shape these bring maybe $1000 - $1500. If it's a later horn, it might be worth more. If it turns out to be a late 1940's to early 1960's Paris Selmer, it could be far more valuable.