I don't know anything about the (?Enfield?)1917, rec.guns newsgroup people might be able to help. It's just that there is so much documentation on, and so many people into the M1 Garand that the info is readily available. I would think there is lots about the 1917 as well just gotta find the people...
That's interesting that Montgomery Ward sold Army surplus guns in the 50's, though...

EDIT Try this site I saw a few threads where someone can give info on dates made.