I'll definitely be getting more familiar with docs, now that I have hands on a true No.4.
I've seen a references about other LBs making it back, but all of them had some sort of non-factory marks. Just to be clear about marks; there are none that don't belong on a wartime LB, CDN issue No4, less the multiple CAs. I was actually surprised to see how my parts have LB on them, including the magazine. Most of them were removed from my EAL.
Regarding the CMK3 sight; Everything I've seen tells me that it's expected on 1942-1943 produced LB's.
I'd actually seen the bolt handle machining, but was oblivious to the font, lol. Stil not impossible that it was marked with different dies, but lol, highly unlikely. I can also make out what may be the surviving curve of an "0".
Everything about the bolt, including the handle (and chunky head), is marked LB. Here's the pics I have access to, at work:
Attachment 122008
Attachment 122009
Speaking of pics.... I no longer think the 4 marks are deer/moose kills; unless these two on the inside are about unlicensed kills.
Attachment 122011