Most important learn your proof marks! Especially the de ac mark. That is what makes the de ac legal, NOT the bit of papaer. Check the state of the metal and woodwork finish, any obvious diffrences in blueing point to a bitza. The SMLE Rifle Number 1 Mark 111 or mark111* have and still are being copied . Bolt and reciver should match numbers. Also check sights, some are marked in meters, obviously not Comonwealth. http://www.leeenfieldrifleassociation.org.uk/page.php?domain_name=leeenfieldrifleassociation.org.uk&viewpage=histor