Longacre's Indian Head design. Examples of this design are known as follows:
Aluminum with plain edge J561/P622. 100 of these were struck per J. Colvin Randall. This is confirmed by letters Roger Burdette found in the National Archives - NARA-P E-111A.
"Order received July 16, 1867 verbally from the Director. 200 Aluminum, of the Specimen Five Cent piece. (100 delivered July 18, 1867 to Mr. Thacher.)"
There are 3 in the Smithsonian, 2 in the ANS and solo examples in the Connecticut State Library, Durham Museum and British Museum.
Aluminum with reeded edge J562/P623 with fewer than a dozen confirmed. To see all available images of this and the following, click here.