Michigan Wheel prop identification

[dfrants]

Found an old two blade brass Michigan Wheel prop. It has " AJ 704 cupped " stamped on it. It has 15 splines and looks like the old Quicksilver race props mercury used on their in-line sixes.

 

[jimmbo]

Bronze, not Brass. 13" dia and 29" pitch. It was a racing prop for the 4 cylinder 65hp, 80hp, 85hp, and the inline 6s.