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Thanks Martin :beer1: There seems to be either a "010" or "C10" stamped into the tang thingy as well, and my amateur sleuthing came up with this:
141612
141613
141617

10Pups, you're right and...

I've spent about 15 mins with Dremel rotary wire brush and Mothers on this.
I'm not too sure, but I see little evidence of any honing, (bad eyes don't you know)
yet the "L and D" in Sheffield are...