A few hundred $$$ for 80 metres of 10 mm chain is OK.
- some chain has markings on it, so you know where it is made ir what type of chain it is https://www.anchoring.com/blogs/anch...ut-chain-types
- I would take all the chain out on deck
or on the jetty and let it go through my hands, checking for damage and deformities
- check this chain on your windlass
first, the chain might be 3/8", or just not fit properly on your windlass
- check if the galvanising is still in reasonably good order, but even if the first or last few metres looks bad, cut that off, and dispose