.36 caliber, 5″ six shot barrel.  Bar hammer double action with engraved recoil shield.  Walnut bag grips.   The barrel marked “ALLEN & THURBER, WORCESTER  / CAST STEEL”.  In very fine original condition with the barrel showing blue mixing with plum patina.  The recoil shield retains much of the bright blue and engraved frame mostly a gray/brown patina.  Mechanically sound.  In it’s original case with accessories.  The flask has a note wrapped around it that is difficult to read but appears to be period.