Vintage Sinclairs Magazines. Sinclair Consolidated Oil Corporation monthly dedicated to American concept of service which petroleum typifies. Initial issue date August 1917. Inside pages printed in duotone ink on sepia paper. Covers are color printed in flat tones from line plates. Articles and photos regarding Sinclair and the petroleum industry in general. War years, motor sports, airplanes, factories, domestic and foreign operations and terminals, ads, research, transport. Dates of issue (s) : Oct.,Dec.-1917. Jan.,Feb.,Mar.,June,July,Aug.,Oct.,-1918. April,Sept.,1919. Mar.,April,June,July,Aug.,Oct.,Nov.,Dec.-1920. Jan.-1921.Make offer.