Longacre's second double eagle design struck in 1850. This obverse die was created as a replacement for the high relief one used to strike the unique 1849 double eagle J117/P132 which supposedly didn't stack properly.
This obverse die was rejected and a third obverse die was later created.
These dateless coins were as follows:
Silver J126/P148 with 2 known as follows:
1) Judd, NERCA 79 ANA, Bowers and Ruddy Rare Coin Review #38, Auction 89, Queller-Heritage 1/09 - NGC62.
2) Champa, Bowers and Ruddy 5/72, Evans, Bowers and Merena 8/98, Southern Collection, Simpson Collection - PCGS64 and is the illustrated example.
Copper J126A/P148A which is unique. It is ex Kosoff in 1971, Harry W. Bass Jr. Research Foundation and is gold plated. Its specific gravity turned out to be 8.92 per Lawrence J. Lee, curator of the ANA Museum on 9/5/2002. To view this piece, click here.
Photo courtesy of Bowers and Merena.