Ron Guth: Judd 15 is represented by three examples, all of which are die trials for the 1794 Half Dime. Two of the known examples are die variety Valentine 3, LM-4 (Pollock 19) and one example is die variety Valentine 4, LM-4 (Pollock 20). All known examples have reeded edges.
Sources and/or recommended reading:
"Federal Half Dimes 1792-1837" by Russell Logan and John McCloskey
"United States Patterns and Related Issues" by Andrew Pollock III
"United States Pattern Coins" (Ninth edition) by J. Hewitt Judd, M.D.
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