This is an obverse die trial, in white metal, of the Sheldon 285 variety. It was struck outside the mint, possibly by Joseph Mickley or Montroville Dickeson from a die sold by the mint as scrap.
It was used to coin J41/P6180 again outside the mint.
I believe its first appearance was as lot 161 in S.H. and H.Chapman's 7/22/01 sale.
Photo is a scan from the Bowers and Merena 3/97 sale.