The 1794 half dime in copper. These are believed to be true trial pieces to test the dies and are known for 3 of the 4 Valentine die varieties of this year as follows. To see images of all known examples, click here.
Valentine 3 with reeded edge J15/P19 with 2 examples known as follows:
1) Woodin, Newcomer, Lohr, Bowers and Ruddy 11/76, Stacks 1/87, ANR 12/03, southern collection as NGC64BN, Simpson-Heritage 2/21 - PCGS64BN with lint mark on cheek. It is, of course, the Adams & Woodin plate coin. It is also a flipover doublestruck mint error.
2) Auction 85, Queller-Heritage 1/09 as NGCAU55BN, Heritage 5/22 - PCGSAU53BN
Valentine 4 with reeded edge J15/P20. This is believed unique and is ex Parsons (H. Chapman 6/1914 lot 342), Brand (journal id #91902), (see B.G. Johnson 7/19/40 invoice to Boyd and 9/16/40 invoice to James Kelly), Judd, Champa-Bowers and Ruddy 5/72, Dr Caldwell-Bowers and Ruddy 11/73, Crouch-Superior 6/77.
One of these is ex Mickley, Col Cohen.
Valentine 2 with plain edge J16/P21. This is also unique and is ex Winsor (S.H. and H. Chapman 12/1895), Brand (journal id #19123), Norweb-New Netherlands 9/53 (41st sale), Stacks 1/87, Southern collection, Simpson-Heritage 11/20 - PCGSAU50.
Photo courtesy of American Numismatic Rarities.