Ironhead: I just had the sight off, and I couldn't answer that, since I don't have any frame of reference. No serial# on the sight, but it shows no sign of refinish.
Edit: looks like it was a frame that was too young to be drafted before the war ended, and became a professional sportsman, so to speak.
Someone may know if the frames were kept in the white, then machined for Target sights. The bbl sight boss is target.
Quote from SCSW: "some will be observed built on military inspected frames, probably originally for the 1917 model, with eagle head mark on the crane cutout and with factory lanyard ring."
That's what I have.