I collect Greaves and I would guess this is a regrind. B.J. Eyre only used the Greaves stamp for I think 2 years (don't quote me exactly on that) before moving on to his own. Generally i've found the razors that don't say "Sheaf Works" in the stamp are the older blades prior to them opening the sheaf works.

Here is my newest Greaves Wedge

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