There mid-80's Aramith made balls. Looks like they they spent some time in a garage or a storage unit exposed to heat and humidity.
Hit them hard with Aramith restorer and Speed shine and a ton of elbow grease and they will clean up nicely. But where you have yellowing in the deeper chips it's going to be really hard to get rid of those marks so don't expect too.
Play with.them hard, and retire them in a year or so when your ready to get a new set or find a better used one.