Bruce, I used galvanized 7 years ago and to be honest, it looks as good today as the day I beat the hell out of it with a hammer. Granted, I anchor in fresh and brackish water a lot, but I also anchor regularly in salt water.
The links are cheap enough that I just bought two with the intent of replacing #1 when it started looking different. I keep a tie wrap on it at my 90 ft marker and check it out regularly throughout the year. So far, so good.
I found having a heavy steel plate (or an anvil) makes peening the link more effective and predictable. Having a good flat hammer matters, too.
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