H.S.B & Co. Ruso, Chicago, .410/.44 cal. single shot shotgun.  Serial #A51120.  Good condition.   26” barrel has clean shiny bore, cold-blued finish.  2 ½” chamber for .410 or .44 spl. shotshell. Frame is turning patina.  Stock and forearm have old re-finish.  Crack in wrist area.  Gun is tight- action works fine. Neat and unusual old hardware store gun!  C&R OK.