Herb,
I think the other photo on the copy-protected web site of the "Tom Heller" or the otherwise named "Tommy Hitler" presentation M1900 (photo of the chamber shot from the side) does show the same type of chamfer...but maybe not as deep.
From the stylized engraving and the nicely done refinish...I would bet it was done by the same craftsman...but this is just a WAG...
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