This is a nice WW2 era German Mauser K98 Rifle. It has
the early walnut stock, adjustable rear sight and is complete with bayonet
The receiver is crisply date stamped 1937 and with the
Nazi German Wartime code S/42.
The weapon retains its waffenamt & inspectors marks and has feint examples stamped into the butt
All parts appear to be matching, see images below