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I get mine from my local woodworking shop but this is what it is Buy Veritas Lapping Powder (4oz) from Axminster, fast delivery for the UK
77996

You can get a range of grits.

I actually just...

I actually won't be much help lol but I would lap it and re post some photos. They generly come up very different once they have been freshly lapped and it will most likely make it easier to identity...