Can anyone tell me if 35yo windsurfing equipment (boards, sails, other gear) all in pretty good order (hasn't been used for 30 years) is saleable or best for the tip? Any comments helpful??

best for the tip.

The board may be worth something

All depends on how it was used / treated / trashed in the first 5 years

If in dough chuck it out (30 years ago)

It really depends what the gear is. A Crit D2 might be of interest or a Mistral Pan Am for example from 1983. A collector or enthusiast would need to know what the gear is. The state of and condition of the gear is vital to know. Photos and particulars would help. Most gear from that era would attract the comment ( as is inherent above ) that the seller should pay his or her own tip fees and not attempt to pass them on,with a premium, on to the buyer.

The landyacht boys will take the masts and sails off your hands!

A wooden boom is kinda cool man cave stuff , $ 20 ?

Post some pics. Show us what you've got, even if it's only for reminiscing.

My first downwinder 20 bucks