(1) I hesitate to speculate on the probability that the rifle you examined has not been overhauled. I can only state that original examples are extremely scarce.
(2) Walter E. Strong (W.E.S.) is the correct inspector for an early 1921 rifle. That's documented!
(3) The rifle you describe in excellent original condition should start at about $2500 and go up from there.
Hope this helps. Happy Holidays!
J.B.