I know you are not coming to Missouri, but since you are looking for a rare air meter I thought you might be interested in this one.
Early next week I will be going to look at a pair of ECO 120 Islander Air Meters. These are the rarest of all the Islanders, there are the round type, not the ones with the curved corners. Both are complete with the Model 90 Series meter on the top, The only thing missing is the front of the meter where the hoses come out, but by using the other one it can easily be duplicated. If I purchase them I will be selling them for $12,000 as a pair. Let me know if you have any interest.
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available