I would like to make a suggestion to all. When you decide what item to collect, pick items that are still usable, they seem to be the things that keep going up in value. Right off the bat, baseball cards have lost a lot of potential customers over the past 10 years. They are fun to look at but not usable, especially if your trying to find a buyer.
Consider thing like guns that are usable and collectible, and fairly easy to sell.
Vintage guitars are attractive because you can play them.The older the faster they sell. New ones just don't sell.
As for Enduros, mostly early 70's motorcycles that you can ride, like yam enduros like a JT1L, Bultaco Pursang, Matador, Hodaka Super rat, a Harley Hummer, certain Hondas like a "Postie".
The dumbest collection I have, is Las Vegas Casino ashtrays. Cheap but disappearing very fast. An item you should not use.