The following information is from Heritage's April 2019 sale.
These pieces, apparently another attempt at a universal coinage, were reported to have been struck on planchets which were one part gold to four parts silver, and are attributed to a Mr. Emil Greeff who was identified in a May 14, 1896 newspaper article appearing in The Newark Daily Advocate, repeating an article from the New York Herald. William Woodin displayed examples of both at the 1914 ANS exhibit.
These probably should be in Appendix C of Judd as follows:
Fifth Talent JC1896-1 with fewer than a dozen believed to exist. This is quarter sized and weighs 6.5 grams. Click on the thumbnail to see an enlargement.
One Talent JC1896-2 with fewer than a dozen believed to exist. This is 37.0 mm, slightly thinner than a silver dollar and weighs 32.59 grams.
Photos courtesy of Heritage.