Who made these?

[BFBOB]

I've become kind of fond of these V-groove pattern wrenches, and I'm curious as to who made (or makes) them. The first I saw was a Snap-On, and was surprised to then see an identical wrench marked Thorsen. I've also seen Bluegrass, Action and Powr-Kraft. Alloy Artifacts was no help, though they did pin down the dates (for Snap-On) as 1953-69.
Anybody know?
And does anyone have examples of other brands? Please post pictures!
It's a distinctive enough design that I tend to think they all came from the same manufacturer, but I'd like to hear from anyone who actually knows!

 

[ryan20021982]

Thorsen made the Bluegrass wrenches in the style you posted, they were made for and sold by Belknap Hardware as their exclusive brand.
The Action wrench is also a Thorsen, it was their economy line offered in 1957, but that style you have was not made that early that's just when that line started.

 

[3baygarage]

I always took it as Thorsen was the maker of that style.

 

[3baygarage]

Was trying to think of any others had a brain fart for a while.

Dayton is another in that style.