Purchased this at the auction last week.
Diameter is approximately 12 1/8 inches.
Length is approximately 30 5/8 inches.
I installed the bolts in the rear to protect the threads.
It has obviously been repainted as you can see some of the “training blue” at the base. I tried to remove the silver with mineral spirits. No joy.
I received some basic guidance from John S. (Thanks, John), but am looking for further information.