Not up to speed on Eco Air Meters so need a little help.

Have an opportunity to buy an Eco Model 240 air meter - unfortunately it has been taken apart but from what I can tell it is pretty much all there.

What would a 240 unrestored in decent shape go for these days?

Thanks in advance for any input.

Picture added.

Missing top reel for water? Are these available somewhere?

Reels are very hard to find but do show up from time to time, not the same as air reel.

Thanks Rocco, I did end up buying the air meter - had a couple guys PM me with info on pricing so feel good at what I bought it for. Also have a lead on a water reel, but if anyone on the site has one for sale or knows of anyone who might I would appreciate the assist.