I think its homemade. Toothing blades have about 18 zillion micro tiny teeth.
This style of scraper, humble as it is, is the most universally useful scraper style there is. Simple bulletproof.
I have most every style of iron framed scraper ever made in a factory. Not that there are all that many.
There are these and the 81 styles. The 12's and 112 adjustables. The 85 rabetting types and the open blade "yacht scraper" types.
I created and built the worlds only infill scraper, with a tilting tote!

I use this simple style scraper most of anything. More than everything else put together. (except a plain card scraper of course)
The reason they are so cheap on the market is because they were the most successful scraper design ever created. Everyone in the tool business made their own model. They sold like hotcakes and for generations straight.
So now they are so common as to be next to worthless on the collector market. And because they have low value, legions of dipwads think there must be something wrong with them, and fight like hell to get the other models. They buy the other models and find out they are finicky to use, so they decide all scrapers are hard to tune, and just give up.
While the simplest, easiest to use scrapers ever made just sit around looking lonely.

Idiots abound in this life.
yours Scott