interested in dating this tool.
Candy is dandy
but liquor is quicker
hehehheehehheheheh
Its a Walworth tool. The great pipe wrench company. Stillson worked for Walworth. At the time it was common for employers to generally rip off employees who invented things while working for them. Old man Walworth never tried. The wrenches were always marked Walworth, but the hook jaw had the Stillson name on every one. This is why we know the name Stillson.
Probably ordered with this name on it (American Pipe Tool), by one of the big Chicago hardware firms. The swing open gate/keeper gives it away. I have one just like it except mine says Walworth.
It only has one bushing. It was supposed to have one for each die. These guide the pipe in straight so you need one for each size pipe.
I have no evidence of its date. I am going to WAG 1880's. As soon as the insert cutters were invented, solid dies faded away very quickly.
yours Scott