Been collecting for a while but I'm new to the forum. Been mainly into cans and pumps and have never messed with air meters. But I came across this older ECO that I believe from looking in Jack's book is a 39. I looked on ebay, etc. trying to find a recent sale to gauge the current value but there doesn't seem to any changing hands. I'll try to post a couple pics but they aren't very good because it hasn't been retrieved from it's resting place. It appears complete, no globe option, and in pretty good shape externally. Can't tell about internals except the dial face is very rusted and will need replaced or restored. Any ideas?