Posting these pictures for documentation purposes here.
This Uni-Compax ref. 22431 was sold by a small German auction house recently.
Haven't seen this reference with EB engravings before. The dial is a redial, however, I think the engravings are genuine.

Anyone else has come across examples of this reference with EB engravings?

 

Offhand I thought EB and FAB in 18k only, no stainless, but that’s just from memory