Looks like that could be a spiral retaining ring still in place.
They are a flat ring that overlaps.

https://www.gwkent.com/retainer-rin...HveTJtXAkwoUQQRY7nXXbPOTqjRoCzboQAvD_BwE

Don

Last edited by 2-Ton; 01/27/2018 4:05 PM.
1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!