By your experience, do things like 8MM film cameras, projectors, editing equipment, or things like 35MM viewers dating from the late 50s and 60s have any value - and where/how best to sell them?
Ditto tape recorders and typewriters from the same era.
Mine have value to me and the same will apply to equipment which others either own or want to own. When selling something it is a matter of finding a willing buyer and online avenues such as eBay and other sell/buy sites are probably the best places to look at. You can search these for past offers/sales of the specific item(s) which you want to sell/buy.