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to answer my own question...
In Response To: Cal. 12 marked cal 7740 ?!? ()

after quite a lot of googling I discovered that the short lived Valjoux 7740/41 had the same chronograph module as the cal. 11/12 -

This one has had its module replaced and somewhere sits a very rare 7740 with no chrono module!

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Cal. 12 marked cal 7740 ?!?
to answer my own question...
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