Bought this PR516 Quartz diver on Ebay. Seller was located in Paraguay, which explains the patina.
Every time I see this watch I want to buy it despite the fact that I already bought it 2 times and finally sold it because I'm not wearing it ! Quartz is maybe my main concern.
Most dial blanks (not just Tissot) were brass alloys. Tissot used a couple of different dial manufacturers during that time but I imagine the roughly 70/30 recipe of copper and zinc was similar for everyone.
Just got this modern, vanilla.... well I suppose Champagne Tissot back from extensive repair and full service.
Normally I just buy vintage but this one was sold as good for parts which seemed a shame to waste a still almost current production watch in this way especially as all the parts are available and you could still buy the complete watch at a retailer from new stock.
I suspect this is going to get a lot of wrist time from me.