This is lot #1347 in the upcoming RIA Premier Auction. It was scheduled for April, but has been postponed – check their web site for upcoming Online Only auctions every month, though!
William Tranter’s Model 1868 revolver was his first centerfire design, and became very popular, made in a wide variety of sizes and styles. One of the very rarest of these today is the 5-shot .577 Boxer caliber, an absolute monstrosity of a revolver made for British adventurers worried about facing down lions and tigers. This is the only known engraved example, and it is beautifully done.