Was pretty rusty so I buffed it up a bit.
By "buffed" do you mean painted, too? Because that's the most red paint I have ever seen on a Plomb pipe wrench!
Does it have a typical Danielson date code on the movable jaw?
I think you mean static jaw, Don, although I do have one example that has a date code on both the dynamic or moving jaw and the static jaw.
...I suppose they could have been buying pipe wrenches from Danielson earlier.
Couple things on this supposition...
Plomb did not offer pipe wrenches in a catalog until No. 19-R FOURTH PRINTING. For context, Catalog No. 19-R THIRD PRINTING is the first catalog that used an illustration of a J.P. Danielson adjustable crescent-type wrench, instead of the illustration of a Utica adjustable crescent-type wrench that had been included in all previous catalogs. Because we know Plomb purchased J.P. Danielson in November 1946, cleverly "switching suppliers" by buying out one of Utica's competitors, Catalog No. 19-R THIRD PRINTING cannot be earlier than November 1946. Which means that Catalog No. 19-R FOURTH PRINTING is even later than that. That means that Plomb did not offer pipe wrenches until they purchased J.P. Danielson. Now they were making their own pliers, adjustable crescent-type wrenches,
and pipe wrenches in the same factory.
That makes even more sense when you consider that Utica did not make pipe wrenches. There are NO pipe wrenches in any Utica catalogs. I checked 1931, 1939, and 1952. Plomb was clearly getting their pliers and their adjustable crescent-type wrenches from Utica before they purchased J.P. Danielson in November 1946. But even if Plomb had wanted to offer pipe wrenches earlier, Utica did not make them.