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4 AF Working Movement

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


Reverend Rob's picture
Reverend Rob
Panel Member
Posted May 11, 2017 - 9:26am

The series has no fewer than 6 different ebauches, all with slightly different sizes. The ones based on the FHF 52 are 4 2/3 x 11'''. That would equate to  10.52  x 24.8 mm.  

The ETA 746 (4AM) is slightly smaller, at 4 1/4 x 10''', as is the Peseux 90 (4AB) This would be 9.58 x 22.558 mm. 

The only way to know for sure is to actually try them in the case. There is also the issue of the placement of the dial feet, which will vary depending on the movt.

Precious metal models don't always have a plated equivalent, especially with ladies models. My theory is that some of these were a special production run, including one-offs. This practise continues to this day.

Posted May 11, 2017 - 12:46pm

Rev Bob -

Thanks for getting back to me. I could go broke buying movements until I find one that fits. The case is absolutely beautiful. I’ll measure the case inside dimensions.


Any suggestions on what to do ???