When I lined up 19 restored ECOs at Carlisle & Hershey years ago, the first question was always "Do they work?"
It would probably help you sell the meter if you posted a picture of it, and stated the condition of the mechanism.
Jack Sim
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at
www.gaspumpbible.comAir Meter ID book also available