Some time ago Reverend Bob wrote ...
4AE, 4AF, 4AH, 4AN, 4AS, 4AW, and 4FL are interchangeable. Based on the FHF ebauche:
FHF 52, some with Breguet overcoil.
.... I have a Platinum 38 Diamond case in need of a working Bulova movement. Old (no name) movement measures 21 x 9 mm. I think the eubache for the 4 series movements above would work.
Thanks Ken S