In 1888, at the height of his career, Nimschke received a commission to engrave a Colt Single Action Army revolver for Mexican President Jose Manuel del Refugio Gonzales Flores. The resulting firearm, known simply as “Black Beauty,” is widely considered one of Nimschke’s greatest works and serves as a remarkable display of his skill and artistry as a firearm engraver. and outfitted with the 7.5" barrel typical of the era’s Single Action Army model. Gold bands, borders and inlaid gold scrolls highlight the exquisite finish, and Black Beauty is one of only a few Nimschke-engraved guns to feature such extensive gold inlay. Black Beauty sold at Rock Island Auction Co. on May 2, 2025, for a hammer price of $1.6 million—the second-highest amount ever paid for a Colt Single Action Army revolver.