This is a fairly early production Henry Deringer manufactured about 1836-1837.  The barrel has two gold bands, while the mountings on the gun, inlays, trigger guard, etc. are Sterling silver.  You will note the early style hammer and early style engraving.  This is among the earliest Henry Deringers to receive a "P" proof on the left rear barrel flat.  It is interesting because the "P" proof is literally stamped in the middle of the nice, engraved panel.  During this time frame, the trigger guard is usually the only part of the mountings that is engraved, while there is ornate engraving on the lock, hammer, breech area and tang.  This gun has a 3 1/2 inch barrel with an overall length of 7 1/4 inches and is in about .44 caliber.   The checkering is still nice on the grip and the gun has a pleasant, light patination.   SOLD!!