[Uffda]

I've bought three similar sets around here for $10-40. Your wood looks in much better shape so I would guess up to $100 if it has all the tubes. Be aware it uses two 45 tubes which are a bit expensive to replace. When a seller says just needs a tube or two, you can usually be sure they are not the cheapest ones.

Yes, at a local auction/swap meet these may go for next to nothing, but if I really like a particular set I'll pay a little more to a private party. I like hearing the history of it and sometimes you luck out and get original paperwork with it.