i've found a proof first sold at baldwins, described as the following Great Britain, BRITISH COINS. Victoria (1837-1901) Victoria, Proof Halfcrown, 1850, young head left with two plain fillets in hair, plain truncation, date below, rev crowned quartered shield of arms within wreath, edge milled (Davies 575; ESC 685 R4; S 3888). Attractively toned, good extremely fine and extremely rare. ex Colin Adams, Spink Auction 161, 1 December 2005, lot 684 Estimate: £2500-3000