The so-called "Koulz" alloy pattern. These were called Kouly's alloy in the Chapman brothers 1881 Lefferts sale. Research by David Cassel believes that the alloy is actually that of Montchal Ruolz. For more on this, click here.
The first appearance for this pattern was a 4-piece set offered as lot 313 in Haseltine's 3/1876 sale.
This exists in the following combinations.
Ruolz (formerly Koulz) alloy J716/P795 Existence of these have been confirmed through the research of David Cassel. Metallurgical analysis is recommended to differentiate these from J717A/P798 although these tend to weigh 45-7 grains. Over a dozen are known including examples in the Smithsonian, ANS, CSL and Durham Museum.
Silver J716A/P796 which appear to have been struck on regular 38-9 grain dime planchets. At least a half dozen are known including one in the Smithsonian. To see images of this and what follows, click here.