Do I understand that you have one of these and want information, or are you seeking information on one you remember? If you have one, why not post a picture here on this forum for all of us to see, someone might recoginize it. I have written a book on air meters and is doesn't sound familiar and also I have no information of A.O. Smith every making an air meter. They did acquire the Erie Pump Company who sold air meters for many years. They thing about Erie is that they never made a air meter, they were all made by the Romort Company of Wisconsin.
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at
www.gaspumpbible.comAir Meter ID book also available