Need help with identifying these watches

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I was searching for vintage watches on a local shopping site in my country and stumbled on some vintage omegas, but I know almost nothing about vintages and especially about omegas. Would appreciate any help.
 
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I think the DeVille was supposed to be a gift for some employees, and its a quartz movement.
 
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For the two that are vintage (2nd and 3rd), you can find the reference number for the model on the inside of the case-back and the serial number on the movement. By searching using the former you can find information about that model, and using the second you can determine the approximate production year using tables on the internet. If you have specific questions, please post better photos and I'm sure people will try to help.