I sometimes see stainless steel link chain these days, especially on visiting overseas boats. We can purchase the stuff in NZ, but probably at a price beyond me.
Years ago, before we set off on a Pacific jaunt with the kids we purchased new galvanized chain for about $700. A couple of years later it required new galvanizing (I’ll use the US spelling) at a cost of $600. This new galvanizing from a Whangarei plant lasted the distance around the world. Which goes to show, the coating on new galvanizing is only for show, and a proper hot- dip process which is quite a process, is long lasting. In order to preserve this valuable coating I wash the chain with fresh water if it is to be stowed for any length of time, and end for end it when one end is getting a bit thin on zinc.
Avon Industries in Whangarei does a grand job of galvanizing items. Lately I had the anchor done, and it should last ten years plus. They put lead back into the sharp end, but I removed mine using a blow torch.