A.A. Weinman's so-called Mercury dime. This is one of several different designs he produced. This used to be J1794 in earlier editions of Judd.
This one has the thin head and neck. Pollock lists two different patterns using this style of obverse, P2037 & P2038, but, according to Roger Burdette's "Renaissance of American Coinage 1916-1921", only one pair of dies was made. P2037 is the result of overpolishing of the dies resulting in the wearing away of design details.
At least four are known as follows:
1 & 2) Smithsonian. To view the Smithsonian pieces, click here.
3) Col Green, Farouk, Kosoff-Bowers and Merena 11/85, Heritage 1/05, southern collection, Stacks 7/08 - NGC62 piece illustrated above
4) Col Green?, Superior 9/93, Superior 5/04, southern collection, Stacks 7/08, Heritage 8/12 - PCGSAU58 illustrated below.
A possible fifth was in Boston dealer's inventory in the late 1970s. Col Green owned 2 according to Eric Newman's journals of his purchases with B.G. Johnson.
Photo of the ex-Kosoff example courtesy of Heritage.
Photo courtesy of Superior.