I've just weighed an ETA quartz movement of that period along with a crystal of approx size, a crystal gasket, a movement ring and stem. Also a couple of spring bars and a few bracelet pins for good measure.
That came in at 16 grams.
On top of that, there is the bezel insert which is glass I think on these. If it has a divers extension on the bracelet that will also be steel I imagine.
I think 20 grams of non gold content is likely close to correct.
It's a difficult watch to price, partly because there are so few with which to reference previous sales.
It's undoubtedly very collectable as a watch,but it's precious metal content lifts it out of the reach of many enthusiasts. It's a small niche market compared to the precious metal market.
I think if you can sell for a few hundred Euros above scrap value that would be a good result. It would also be satisfying to know the watch would live on with a collector who appreciated it for what it is.
