Can anyone tell me what kind of car this fan blade would be for? It measures 13 inches across and the pulley is 1 3/4 in diameter and 1 1/4 wide .The hole is 9/16's. It has the numbers 306757 on the pulley

It is off an Overland four cylinder about 1924/1925.

Thanks for the information. Where did you find the info.?

That may be right, but I doubt that the press-form strenthening is typical of practice before the 30's-40's; of which period I can claim no special knowledge because nearly 40 cars I have are all before that. Of those that have steel fans, (rather than cast aluminium), are Napier, FIAT, Sunbeam, Cadillacs from 1913 to 1927, Pierce Arrow, Auburn, Locomobile, Mercer, Stutz, Roamer, Auburn, and Twin Six Packard. The plain bush is early, you would think: But why did not many cars considered "better" do better?
Ivan Saxton

Model T Fords started the "press-form" fans in May of 1920. Previous type had individual blades riveted to a cast hub.

I have had my 1925 Overland since about 1973. Following a full restoration it has been on the road since 1979. The original fan is as per the photographs. However, because one blade was broken and brazed together I removed it from the boss and replaced it with a fan from a refrigeration unit for safety reasons. The boss on my fan has the numbers 306757 as described and the original blades were of a light metal. It is interesting to note that if Ivan is right the "humble" Overland (as well as the T ford) was somewhat ahead of the "better" cars he describes.