Vintage Omega ref. 2279 CH27 Show and tell

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Please show your vintage ref. 2279

I don’t know much about mine, thus some help would be appreciated.
Crown is not the original one, I’m desperately looking for it.
I hereby attach some pictures
 
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A really nice and important watch... cleaning necessary, a crown will be found, maybe polishing with a cloth only...
But what to do with the dial? No chance of getting cleaned, reprinting not a choice, keeping as is?
Yes, it's a piece with history!