Please help me identifying this watch.

Do you have any clues about the model/year maybe? Oh, and if it can or can't be cleaned. It's inherited and still working. :-)
Thanks a lot!

You have inherited a 1950s IWC Cal 89 wristwatch. 
Was the previous owner a smoker? I believe the stains on the dial are nicotine and degraded varnish from moisture. 

The movement will definitely need a service!

I don’t think the dial can be successfully cleaned without causing damage. 
You have two choices:
1. Have it serviced and Enjoy the watch as-is in memory of the person you inherited it from. 
2. Send it to Schaffhausen for a service and Spa treatment. The dial will be replaced with a similar new one. 
Make sure you ask for the replaced dial back!

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Hi Dorian Man,

i go with Mark's opinion. The case with its staps and markings and the fixed
bars is most likely not of IWC origin.

br Comagnonman