Very good pics Goomba. I have a No.1 MkIII 1942 SMLE. I don't know what the markings stand for, but if you sent those pics to the NRA they would identify them. I would be interested in knowing as well! Mine was stamped on the stock with the crown and "Lithgow 1942". It shoots great. What was the problem with yours? Headspace or bad ammo?