From the Heritage Auction listing:

(1859) $20 Liberty Double Eagle Obverse Die Trial, Judd-A1859-10, Pollock-3232, R.8, MS64 PCGS. Undated uniface obverse die trial or splasher of the obverse of the 1850 (undated) hub of the double eagle. The reverse is blank with paper backing. Struck with no collar, thus no edge, and made of white metal. There are three pieces known of this rare splasher, the other two are in the Library Company of Philadelphia and are from a slightly different die with the stars further in from the dentils. The surfaces are bright and the strike details completely defined. This is a unique striking and the only splasher of the Type One twenty available to collectors (the other two are #37 and #38 in the Library Company inventory).

Ex: Empire Coin Co. MBS #1 (11/1958), lot 103; Herbert M. Oechsner Collection (Stack’s, 9/1988), lot 246; Auction ‘89 (Superior’s session, 7/1989), lot 943; Boyd E. Hayward Collection (Bowers and Merena, 9/1997), lot 1553; ANA Auction (Stack’s Bowers, 8/2014), lot 13293. (PCGS# 529428)