This design is known only in copper and aluminum as follows.
Copper J1285/P1427 with only 3 known.
1) Mitchelson, Connecticut State Library
2) Superior 1/90, MARCA 5/90 as PCGS63BN, Simpson collection - PCGS64BN
3) The former, Farouk, Kreisberg-Schulman 2/60, Harry W. Bass Jr Research Foundation, Wyoming collection - PCGS62BN
Aluminum J1286/P1428 which is probably unique and is ex Newcomer, Farouk, Kreisberg-Schulman 2/60, Wyoming collection and is illustrated above. The Smithsonian listing in Pollock for an example is an error.
The Pollock book lists 2 examples of J1283/P1425 and J1284/P1426 as being ex Farouk but one of each of those was actually a J1285/P1427 and J1286/P1428 respectively.
Photo courtesy of Andy Lustig.