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I just got a call from the Omega boutique. They ordered the FOIS clasp to test if it can be used as a direct replacement for the clasp of the 321 bracelet. The answer is "no".
I asked if one could add a FOIS link to each end of the FOIS clasp and then fit the clasp + links to the 321 bracelet links after removing the clasp with its adjacent links from the 321 bracelet. But the boutique did not really want to go this way: too much "bricolage" ;-)