.22 rimfire, 5″ tip-up barrel actuated by a lever in front of the triggerguard.  Single shot action with external hammer and safety.  Mfg. by the Sheridan Products, Racine, WI. in the 1950’s and the only non airgun firearm they ever made.  Approx. 11,000 were produced.  This example remains in very high original condition and comes with it’s factory box and paperwork.