Value Help

There may be hallmarks somewhere on the case, but if not, it will certainly be clear from what is written inside. If it is gold filled or gold plated, that will be indicated by the details of the stamps. But I think it's probably solid 18k gold, and if you need a very rough value for insurance purposes, a $2k USD replacement value would be sufficient IMO. If you are trying to sell it, you might not get quite that much. If by some chance it's actually gold plated/gold filled, the value would be much less. Your initial post was a bit cryptic, so we don't really know why you need the valuation.

Valuation requires comps, but they can include watches in the same general class, adjusting for condition. One doesn't necessarily get valuation by finding exactly the same watch, with the same case and dial. It's a bit more nuanced than that. And in any case, you don't even have the reference of the watch, so how will you know if it's the same watch or not?

It is often fine to insure a watch with a rider on your homeowner's insurance, or you can insure it separately. The cost isn't too different in most cases. Frankly, most of us would not bother to get separate insurance for a watch like this. If it's lost or stolen, the insurance won't replace the sentimental value. But everyone has a different tolerance for risk.

However, if you are serious about insuring it, you should talk to your insurance agent before you spend too much time coming up with a value, since they may require an official appraisal, in which case you would need to hunt down someone whose appraisal they would accept, and then pay for it to be done. And then you'd need to have the value updated every now and then.

There's no harm in saving old parts. Just keep them safe somewhere.