Wondered if I can get some help as to whether this sign is real and what the value might be approximated at. Copyrighted 1937. "Baltimore enamel...New york??" or something like that wording in bottom right. "Property of quaker state refining company" in lower left 2 sided tombstone shape sign. One grommet missing. Heavy sign. Neighbor's brother has this for sale and just curious if it is worth buying. Thanks for the help in advance

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Looking for early valvoline, freedom-valvoline, franklin pa items, Galena


KEVIN