My limited understanding is that both Mason and Taylor produced the hub mold and from what I've read, perhaps at the same time. As I understand it, Howdy Herz has many of the Mason records. David Spragg and Gene Trimble may have more to say about the possibility of seeing hub mold records added to the Preserving Gaming History site sometime in the future.

If you haven't already seen it, you may want to visit Robert Eisenstadt's Mold Project pages:

http://www.antiquegamblingchips.com/molddesign_geometric.htm