The image was his fourth and last to be featured on Colt revolvers .
The cylinder scene engraved on the first 25,000 pistols was created by banknote engraver Waterman Ormsby .
The image was Waterman Ormsby 's fourth and last to be featured on Colt revolvers .
The cylinder scene engraved on the first 25,000 pistols was created by banknote engraver Waterman Ormsby .