Some help with a Certina DS-2 Chronometer 18K

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Hi guys,
I'm considering making an offer on a rather rare DS-2, a ref. 5880 300 in solid gold with the original bracelet.
The watch seems to be in great condition and it's newly serviced. It weighs about 140 grams, so it's a good chunk of gold. Any idea of a fair value I can offer?
Here's the watch 😀
 
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I like that one. But I've been known to be a sucker for a solid gold cushion case.