I am going to assume something here. Signs were made in large quantities, so the name of the distributer was probably painted on the sign long after it was made. It would be to expensive to make one porcelain sign with the name. Correct me if you have better information.

Jack Sim

Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available