Reno........
The lever boss Code consists of the Inspector's number (first), then a letter indicating the year of manufacture, BOTH of which are iside an OVAL located on the lower, front side of the receiver on the protrusion into which the lever fits and rotates. So the LBC for a Model 99 made in 1953 with Inspector 14 reporting would look like this:
14EUnfortunately, both the LBC and the oval are usually VERY lightly struck and, as a result, they are often VERY difficult to read. You may find that the whole oval and/or part or most of the LBC are not showing due to how lightly they struck the Lever Boss Code.
Since the rifle has been buffed out and reblued together with the stock cut off,
Loggah has given you excellent advice as concerns putting a new butt-stock on your rifle.
As concerns the serial number, it is/was located on the bottom, front side of the receiver just behind the bottom of the forearm. Perhaps it can be brought back with acid and re-stamped again with its correct serial number.
Good luck and welcome to the Forum...
Strength & Honor...
Ron T.