Mystery Tool Help Identify

[oldetymestore]

Interesting vintage tool... slicing?... collet at end, rotating disc with side numbers and 32 holes. Thanks!

[25kenwood]

Try posting it on the 'Machinist' Facebook page.

[sidezskateshop]

I believe its a boat part. For the rudder. $50-80 Im guessing. Use Google Lens and you should see others like it!