About how old is your oldest still in use pipe threader? While I can't say that it still gets much use, I own an old Erie Tool Works threader that holds 4" square dies and has bushings to guide the pipe. It threads 3/8 - 1 iron pipe. From what I know about it in family history I can pretty safely say it's 75 plus years old. I also have a Ridgid that I need to dig out to get the info from that threads 1-1/4 to 2 NPT and it has to be over 60. Let's see what others come up with for their "Old Timer" threaders.