So, yes it appears to be a Canadian driver's license. Its etched on the trigger guard also. If you look at it in the right light it used to say "303 cal" . I'll take more pics
The thing I never got with the EAL's was what they called the "military model" had sporting sights and a 5 round mag. while the "commercial model" had military sights and 10 round mag. ??
I know this is a super old post, but i have an old lee Enfield no4 mk1 i got when my grandpa passed. It has some numbers engraved in it as well. Upon further investigation, it is my grandpa's S.I.N. number. He put it on his rifle for identification purposes. Talking to a couple other older folk, this was a fairly common trend in the 50's-70's.