One of my friends and regular clients sent in his 1000m 980.023n for a full service. It received a new movement, full cleaning, all new gaskets, sapphire crystal upgrade, and pressure test.
These are quite robust and unusual (as far as dive watches go) in that they have some serious water resistance measures to meet the 1000m depth rating. Everything is substantial including some of the largest Gaskets you will ever see on a watch.
I was able to supply all the parts to get this bad boy back in action and on the wrist.
Pressure tested and ready to dive!