Next I have tested the old pop off valve and it goes at 21 PSI the old gauge is fine too and is of the type that can be calibrated, no need for a new gauge.
Here is where I just about bet the old pressure cooker was bought.
It was bought I bet in McKinney Texas at a hardware store called JP DOWELL.
The people I bought it from said they were from the Dallas area McKinney is just north of Dallas.
Here is an old ghost sign on a building in McKinney.
It served the area from 1877 on up into the 20th century.
Here is a link to the information.
https://www.google.com/url?sa=t&rct=...v1G_PK5n_Vm1Ng
Here is the ghost sign.
JP DOWELL.jpg
Coming next is the reason for my conclusion.
Worth