I'd like ID on old wooden prop

[KenS]

I have an old (before 1976) wooden prop. Need help with identification. It is 52" long with metal tips. Made of dark wood with 5 laminations. It is 3 1/2" thick at the hub and has 1 3/8" straight shaft hole at the center. It has 6 mounting holes and other stamped markings: #764 and 4 1/2 X 3 on the back of the hub. Can you help?

[MWP_Lamar]

Can you post a picture? Does it have squared tips? With metal sheathing and a diameter of only 52 inches it may be an air boat or sled prop.

Lamar

[KenS]

The prop tips are slightly rounded. I will try to send a picture.
KenS