Zenith Compax Crono ref. 22507

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Hi,
This is my rare Zenith/Universal Geneve/Martel Chrono ref. 22507. Serial number 762986.
Cal. 156H
Diameter 37,3mm
Bauhaus type dial with stick-style blued steel hands.
Original crown and pushers.
Would be nice to get your comments!
 
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Very intriguing.
What year is it from?
The crown has some logo on it or is it plain?