Look to be in pretty decent condition, but depends on how well they clean up. eBay sold prices say around $15-20 each, and $60-100 for a set. Knock off around 12% for the eBay and Paypal fees if you go that route though.
If selling locally, you will likely get someone who wants to haggle. I'd start it around $100 for the set, as long as they clean up well. If they look damn new NOS when you clean them, then maybe more.
These are sold listings:
https://www.ebay.com/itm/123001374914
https://www.ebay.com/itm/202189273440
https://www.ebay.com/itm/253305231174