The Longacre design without stars on the obverse combined with the 'Standard Silver' reverse of 1870. This was apparently implemented by William Barber as Longacre died in 1869.
These were sold as part of complete sets from the half dime to the silver dollar. To view the set, click here.
Examples were struck as follows:
Silver J1074/P1210 with a half dozen known
Copper J1075/P1211 with fewer than a dozen known
Aluminum J1076/P1212 with only 2 known as follows:
1) Auction '84 (Paramount, 7/1984), Superior, 2/1987, Queller-Lemus, Heritage 1/2009 as NGC64, Simpson-Heritage 2/21 - PCGS64
2) Newman-Heritage 4/13 - NGC66, Simpson - PCGS66
Photo courtesy of Teletrade.