Thanks Rusty - and Bus! Your answer brings yet more questions for me.
Is it fair to say it is more recently covered by patent 1,593,588 given the full side pieces supporting the roller assembly? I'm "trying" to take my best wag at dating it, and better understanding this wrench in general. DATAMP list the original patent (870,781) with manufacturers of:
Attwood Mfg. Co. - Conneaut, OH
Craftman Tool Co. - Conneaut, OH
Pittsburgh Malleable Iron Company - Pittsburgh, PA
Does this mean there were three individual companies that produced a wrench under this patent? that there was three manufacturer (marketing) names? I first had it in my head it was something related to the start of "Craftsman" (the Sears label) as we know it today. This "Pittsburgh Malleable Iron Co." throws a wrench in that for me. Thinking out loud - I wonder why it's marked "Craft" and "PMICO", yet others are marked "Craft" and "Craftsman".
Are there examples found marked with Attwood? Where does this connection come in?
My curious mind has to know more.