Lever shock I.D.

[Terry,OH]

If the number "10" is stamped into the arm at the small reinforcement near the shock link, then the shock is 1940.

[Kube]

Originally Posted by Terry,OH

If the number "10" is stamped into the arm at the small reinforcement near the shock link, then the shock is 1940.

If it has a "10" on the boss of the arm, a "F-837" and the Ford script on the main part of the arm, then the arm is 1940 Ford.
The 1940 arm may very well be on an incorrect body. The one (body) depicted in the original post appears to be to large.