1836 First Steam Coinage Medal. By Christian Gobrecht. Julian MT-21. Mar 23/Feb 22 Date. Bronzed Copper. Thin Planchet. MS-65 BN (NGC). 28 mm. The Thin Planchet counterpart to the Thick Planchet specimen offered above, this piece is of nearly equal Gem quality. The surfaces are smooth and satiny with rich rose-brown patina. Fully struck and visually appealing.