Hello

If possible , I would like know the main differences between the cal. 1520 and the cal. 1131 (Olympic) rattrapante stopwatches in the Nuit Spatiale series, as well as their respective purposes and 'hierarchy' in the nuit spatial series. I know that the 1131 is a high beat movement bit that is about all. Also, were some 1131 movements certified chronometer and others not? Thank you very much.

 

Some 1131’s where chronometer rated I believe it should state that on the case and hopefully have the papers to prove it.

There is not a lot of data out there on these you might try the Omega Museam as I can’t find reference to the other movement.

http://www.vetroplastica.it/forum/viewtopic.php?t=10855

You can try that and run it through google translate to get some info.

 

Thank you very much. If anyone happens to know anything about the cal. 1520 and the differences with the 1131, that would be great.