As the others have said, the changeover to stamped center wheels came along with the 40/60 series tractors.
Documents I have pretty well indicate that cast wheels centers were used on some 140s. (I didn't look into other models.) I have some brochures with pictures of 140s with cast centers. Preproduction illustrations often make their way into brochures so they aren't always reliable. However, some of the pictures are of second style 140s in a 1975 brochure.
Cast wheels also show up in the Parts Catalog. It is the online 140 catalog. If the catalog came from separating 140 out of a combined 100/130/140 catalog, it could be an error as well.
However, my trump card is a '62 general line price list. Some tire options say "cast wheels" in parentheses. It isn't totally clear which options it applied to. It seems to track to the 6.00-16 tires and/or maybe "International" tractors (vs. "Farmall"). The brochure pictures with cast centers seem to show bigger tires.
There are some pictures of 140s in the Wisconsin Historical Society archives. You can see them by going to the search page
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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