British Coins, William IV, pattern crown, 1834, plain edge, bare head r., rev. crowned shield of arms over mantle (S.3833; L&S.6; ESC.275 [R5]; Bull 2465 [R5]), certified and graded by NGC as Proof 66 Cameo, one of the most beautiful and well-preserved examples of this great 19th-century crown rarity
Linecar and Stone referred to this as a pattern, but in reality it is a Proof of Record, sometimes called a VIP Proof, made according to the law of 1800 so as to assure that a few examples of the coinage would be maintained in museums, to which typically they were sold during the 19th century. The intention was not to provide collectors with these coins, but rather institutions. This 1834 crown is literally hundreds of times rarer than the 1831 proof crown issued in the Coronation sets, and it's magnificent - in fact, the ultimate acquisition among coins of this reign.