Help me with this if my eyes and phone don't work too well together, but I see McC & T 09 on the knuckle side of the body, that's:
McConway & Torley Co. 1909
That 1909 is the reason this looks rather heavy duty and still it has an MCB contour. The contour is probably the MCB5. Whatever the MCB contour was newest in 1909 it probably has. I know of the MCB5 and in 1910 the MCB10 came out, that is also known as the AAR -10, which was "the" only standard (for new couplers) from 1913 - 1940 or 50, when the current 10A contour came out, we still use it today. The MCB5 was a popular contour that many units were cast, any they were getting heavier shanks and wall thickness's by then, so you have one of the last MCB contour couplers made, ever, in your coupler.
You could try calling McC&T on the phone and ask them for the engineering dept. They were one of the first AAR coupler producers to move production to China, back in the mid 90's. When you get to engineering ask the person "who would know if you had any of the 1900 era Janney coupler drawings in your archive".
Generally old coupler drawings were destroyed by the ASF chaired AAR "Coupler Committee", but National Steel Casting Co. managed to hang onto their Sharon drawings, that's how the Sharon couplers are still being cast by Matrix, so there is a chance that McC&T has your drawing.
Work the phone, that's the only way.
Also, like Bryan just said, the narrow gauge RR's that use full size couplers, are the most likely place to find this. The D&S use a 1900 era JANNEY on their passenger cars, they have drawings for the knuckles. Good luck getting anything from D&S, as they are just like another tourist RR that does shop work, and makes parts, that we all know of, in which drawings go in, but they never leave. If your knuckle is the same as the D&S varnish couplers, then D&S has a pattern, so you could buy one, if they will sell it to you.
My advise: Get that knuckle drawing, or trade the coupler for a more common shank and save yourself a fortune. Maybe the D&S would want it and would trade you a more common type E -10 coupler for it. Who knows.
Good luck to you, and please report back and let us know how this works out.
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