What is this vintage 2 register Omega Chrono?

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So a franken?

I read the movement is Lemania 872 (Same as Omega 860)...which is legit for this case (the monopusher version would be 2220, my bad) the caseback doesn’t look like I would expect, but I can’t say I have seen an Omega dial in such a case ...only military issued Lemania.

https://www.shucktheoyster.com/lemania-raf-vintage-double-pusher-military-chronograph-ref-818/

https://omegaforums.net/threads/royal-navy-fleet-air-arm-issued-lemania-ref-818.98970/

https://omegaforums.net/threads/royal-navy-fleet-air-arm-issued-double-pusher-lemania-818.93555/
Edited:
 
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Might be. The sweep second hand is the wrong length and the tip was cut off to make it sort-of fit.

Tom
 
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Just a put together. Will have an inner movement cover. I have a NOS Spare case like that. These cases were sold a few years ago by Watchco. Kind regards. Achim