The former Harry W. Bass Jr Research Foundation example. Photo courtesy of David Cassel. Examples are known in the following compositions: Nickel J644/P716 with about half a dozen known. Copper J645/P717 with at least 4 known, 2 of which, the former Bass (PCGS67BN) and Garrett (PCGS64RB) pieces, were in the Cassel collection, a third (PCGS66BN) in the Simpson collection and a 4th graded PCGS62BN. 2 of these are ex Brand - journal #15778 (Stevens 6/24/1896) and journal #44094 (Elder's 6/15/1908 Gschwend sale lot 219). Aluminum J646/P718 with about a half dozen known. These usually show corrosion. The 2 in Dave Cassel's collection had significant amounts of silver in the alloy. The listing of this in silver J643/P715 has been discredited by the research of David Cassel. David Cassel's book on Postage Currency Patterns is now available. For more on this, click here.