Yes this should be done by refurbishment, 45 was assembly number by overhaul. Visible that the grips are not period, as by pre 1938 should be wood, here is brown plastic, and scabbard is missmatch too as different year 1935, the bayonet should be 1936 or 37. You should look at spine of blade for date, same as it would be nice to see the serial number for dbase.