What the heck is this thing?

Yankee Magazine used to have, may still have - I don't know - a column where people would send in pictures of old tools in order to find out what they were supposed to be used for. (The object pictured here is a churn scraper. Note the angled blade for reaching...blah, blah, blah.)
Or

What you have there is a Chinese Harrow.

Of course. What else?

Okay, so a coworker and I were straightening up the Tools Accessories section, otherwise known as the Dump, and we found several old drill chucks, a number of various kinds of drill guides and saw guides and .......

this thing.





It's obviously is some kind of device for clamping something onto either a bench or a workpiece, but what? A router?

Note that the place you would slide the tool into is smaller at the front than in the rear. How's does that work? I don't know of any routers with baseplates that are truncated pyramids. I'm stuck.

What the heck is this thing? And don't say Churn Scraper.

After we solve this mystery I hope others will add their pictures of unknown objects found in the back of their attics, garages and the south end of Nana's blueberry field.

Joe(Never saw one of those before.)Nation