Hi

I have bought 2 old Seamaster Cosmic. Same owner had a Automatic and a Manual . The back has big holes in the gold plate. I have seen a few others on net (also one here in forum), but I have never seen what to do. I have been informed, it is some people's sweat, can do it over years.
But do you have any ideas what to do? I know its on backside but not nice.

 

Another question, what would cause that?

 

The dreaded "trouser polish".

 

you can buy steel cases

 

Unfortunately except for re-casing them there is really nothing (practical) you can do.