Hi Folks,
That distributor pictured above is a 40B-12127 & was used on Ford Flatheads from 1932 to early '36. The stationary points were screw type. The 78-12127 & 11A-12127 were used on the '37-41 engines. The 11A was originally only 1941 but was mixed in with the 37-41 interchangeably...