'kw64': Your 1901 rear-sight is all rifle sight and falsely marked with "C"s. Your rifle sight leaf has a built in drift correction. A real carbine sight leaf does not angle for drift. (The inside edges of the carbine leaf are parallel to the outside edges). A correct 1901 carbine rear-sight costs about $250.

It is hard to tell. Some of your photos appear like there is some refinish of metal or wood. It could be just the 'Flash'.

IMHO - What I see is worth $700-$800 (value of parts). I would give it a higher value, if I saw it in person and saw that every thing appeared to be the original looking finish. The picture of your front/sight muzzle area looks good, as does the action. What is the condition of the bore?

The 'OALW' plate, you mention, bothers me. It sounds like it is recessed in a sling swivel mortise. You have a real carbine stock. However, I don't like carbine stocks that have been fitted for a butt sling-swivel. You have a nice stock, but, the '1901 cartouche' date does not match the acceptance period (1899-1900) of carbine #235XXX. It is a pretty looking carbine.

I hope this is helpful.