.36 caliber, 6″ barrel rotating barrel, bar hammer and spur triggerguard.  Walnut bag grip.    The barrel and engraved frame show a pleasing gray-brown patina.  Fine grips and varnish.  The barrel marked  “ALLEN & THURBER     WORCESTER”.   Mechanically excellent.  I comes with a contemporary  case and accessories.  The mold and flask are of the period.