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Unusual plane

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Joined: 3 weeks ago
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Unusual plane. Not marked, probably made by pattern maker. I have seen other examples of this plane. 

The cutter is 1/8" wide until it gets to the bottom where there are protrusions on each side. Testing, I found it necessary to first cut a 1/8" slot followed with this special cutter. My thoughts are this is used to make screen windows. You would push the screen with a cord down into the groove where it would lock on. Anybody have a better idea?

Groove 4
Groove 2
Groove 1