[Zeke3]

I have two 1937 frames. One frame has the serial number stamped between the two large rivets that attach the steering box bracket to the left frame rail. The other frame has the serial number stamped between the group of three rivets and the inner edge of the frame flange. The group of three rivets are the rear rivet for the steering box bracket and two rivets for attaching the “X” frame to the outer frame rails. I hope this helps your search for the serial number.