Pop Quiz: movement identification

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I'm just with my watchmaker and we're looking at a collection of movements just in when we pull this out:


Dial side measure 44.13mm; 42.41mm across the movement (19 Ligne?). Neither of us have seen this, nor can we remember seeing Omega signed on the regulator bridge.

Can anyone identify?
 
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Somehow managed to repost - Please ignore until I can delete or Mods feel free to remove.

My apologies