Thanks for the picture. There is quite a bit of difference. Mine says TRADE before rigid, then the word MARK, then the patent # followed by 10. No where does it say heavy duty. It is unpainted with no traces at all of paint. The writing on the adjustment is much smaller as well.
I have a ridgid 10" pipe wrench that I borrowed from my dad 30 some odd years ago. i would like to find out if it is one of the first ones ever made. I am pretty sure he got it from his father who owned a plumbing bussiness in East St. Louis in the 1950's.
on one side of the handle is: THE...