This metal finishing sort of like a Blade Jig on a Worksharp
Here is an interesting explanation of how the (long unknown to most USA buyers) GRAND SEIKO premium line of watches gets its uncanny case shines and facets.  The jig looks like it could mirror-polish your woodworking iron bevels as well...

I had the opportunity to examine a Grand Seiko watch the other day, and it is one high-end wristwatch.


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