This handsome revolver was made in several variations; Early pistols were single action, but most are single/double -- like the one pictured. I think they date from the '40's or early '50's, and are worth what you can get -- probably $200 or so, depending on condition. Let me check my old book.
It's listed as the 999 in my '47 Stoeger's catalog. Price: $35.44 (Single Action only)
ETA: I'm fairly sure "Sportsman" is the "999".