Measuring the barrel tenon is the way to tell long or short action requirements.
If one looks at early long framed navy's on Simpsons site, say early 1906's versus later 4" navies on same site.............looking at the frame curvature just in front of the takedown pivot might infer that yours is a long version. Purely conjecture from here, measuring is the absolute way; I am sure G.T. has a depth mic.
The 2mm difference is about a turn and a half on said barrel threading, so if one got a short barrel for a long frame; the shoulder would have to support said modification(set back).
I appreciate seeing the attachment of the forearm hanger, something for me to save off as a piece of knowledge. Also thanks for the general posting of your new acquisition.
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