From what I've read, the scopes were old recycled patterns originally fitted to the SMLE Mk III sniper rifles of WW1. The scopes still bear the serial number of the SMLE they were originally fitted to (as this example does). Only the mounts were numbered to the rifle. Other than what I've read in a few arms books, I have no idea where these saw service or if they were stored, then disposed of, post WW2.