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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According to OJTT 19 Ligne CHRO L 15-16p from 1898 Serial number should be under the dial. Designed by Francois Chevillat and called a Chronoscope
 
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I forgot to check if there was a prize๐Ÿ˜‰
That was pretty quick and very precise - thank you. I've been driving for the last few hours so this was my first chance to reply.

You can have any prize from the bottom row ๐Ÿ˜‰