33 NOS Socony Oil signs were sold at Iowa Gas. They were found together back east. Most were the aircraft version shown in this image. Most of them sold for $1500-$2500 depending on condition. There were some with no airplane graphic, or "Aircraft" wording for less.
This is the crowd that gathered when the signs were first laid out. The sign without the airplane is visible on the lower right.
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Jim "Oldgas" PottsYour host and moderator