Need some input from you MOBIL sign guys....Have an opportunity to buy a MOBIL lighted sign. Sign is round, approx 36-40" dia. approx 4" deep and made of thick plastic (I think). Power cord is gone, so don't know if it works or not. Only ref I can find for a pic is in GAS STATION MEMORIES, by Michael Karl Witzel, page 52 on right side of page...Any comments on what this sign is worth???...thanks in advance....Warren