I came across an interesting reference on the web that may be a rabbit-hole down which some researcher might wish to descend (assuming someone hasn't already). It's the Digest of the Opinions and Briefs of the Solicitor of the Treasury; specifically those of 1/24/1888 and 11/27/1909. The former refers to the Linderman case and the decision to shut down Lyman Low's sale of his pattern coins. The second refers to the $50 Unions.