Look carefully at the sides of the pins and maybe at other places on the drivehead/moveable square drive part with a magnifying glass to see if there is a tiny "strongarm" symbol
wonder if the drive part could have been made in a different factory than the handle or pin?
"strongarm" symbol was Armstrong Tools but I think that factory as well as Easco/Moore Drop Forge might have been taken over by Danaher and then later perhaps closed
I didn’t see any markings around the anvil area.
I do notice that there is no crossbar hole like the V series.