Yes, great ID! Thanks! The old Stanley Fibre Board Cutter Groove and Bevel
Cutter Holder for Re-Sharpening Type Blades. Why didn't I think of that??

From the original estate sale photo, it appears to be sitting on the bed of
a (heavily used) miter box. I think I overestimated the size of the thing,
seeing it as closer to a Stanley #80 two-handed scraper, for example.

Anyway, pretty nifty in terms of gizmocity, if not actual utility, these
days. Anybody need to re-sharpen their groove and bevel type blade?

Take care, all of you,

Greg Isola
Alameda, CA