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Get the SN and contact the factory. They usually respond next day for email.
Besides the crown what else is gold on the watch? Normally everything you need is on the case back. Ask for a pic and you should be good to go
Just browsed a bit.
Search for Sinn, Ref. 8824 (probably yours) and 8826, Titanium. It is sold as a watch for woman.
Did not found exactly the model you are looking for, but two different version.
Hope, this will help you.
Well a google search for 8828 shows the case looks like the one above, and there is a two tone case 8828 on eBay. But I did not see any full lume dials.