Morgan and others. Please don't take this as criticism. .
I have been a salesman all my life, I think I know how to sell items where I can make the most money. If this top had been mine, I would have taken it to my sandblaster and had it blasted. The cost would have been between $20.00 & $30.00, even cheaper if I had included a number of other pieces I needed blasted at the same time.. If I had a nice warm location to keep it, I would have left it the way it was, if I had to place it in a moist place I would have used a spray can of primer and given it a light coat. Then I would have asked $175.00 to $200.00 for the top.
Many people are resultant to purchase rusted items, spend a little money then ask a little more for your effort.
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available