I just saw your post today. I recently acquired a large number of antique parts and I have four of these regulators. Two of them have intact crank handles and operate. Two of them need the crank bearings freed up. It's a nice day here, so I will go out to my workshop and soak them with some pentrating oil. All four units are in good looking condition and even retain a lot of the original paint. They were stored in a shed for many years.
I am going to list them in the for sale section with pictures.
Thank you, Justin