Not sure if CR means complete refurb , normally they were marked FTR for factory through repair . what I find interesting is that it looks as though it has had a hole drilled through the nocks form. The person who can tell you what it all means is Peter Laidler ,he was an armourer in the Brit military .

http://www.milsurps.com/forumdisplay.php?f=72&s=b5ef129171f5e6d6f2bdf59cc0984381

Cheers
Pete