I've been sitting on one for awhile now that was picked up by a friend of mine at a gun show a few years ago. Currently fits the No1Mk3 but appears to have been initially manufactured for an earlier varient and then modified. Has the old C-type magazine spring which I had never seen before, now have I seen one since. One of the markings I can't seem to be able to positively decipher looks like (smaller then sign, small case o, larger then sign).

Any ideas ?
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