This 12 3/4" Tower & Lyon Engineers wrench is probably the 1882 Donahue patent version, with slanted jaw teeth on a spring-loaded jaw. I welcome other views on that. It had been lying under some other things when I found it yesterday morning in Central PA. My first impression was, "It's another Bemis & Call wrench".  Then I looked more closely.

I was asked to show "before restoration" and "after restoration" photos, so I have.

Additional matter:  I have an Agril Engine Wrench, also covered by the 1882 Donahue patent. It is identical to the T & L  Engineers Wrench, including slanted jaw teeth. (See bottom picture)

Did T & L make both wrenches?

That's a very fine wrench, Bob!!

Nice Bob. That is what we, here in the monkey wrench clan, call "The Good Stuff".

Sweet piece!