Original oil and gas trade magazine vintage ad for INTERNATIONAL HARVESTER COMPANY. Main office and factory was located at 180 North Michigan Avenue, Chicago, IL. 134,000 Hours and Still Going Strong! Completing 16 years of steady service, this International U-6 engine is still a regular producer for Calvert Exploration Company of Tulsa, OK. This unique 1962 old petroleum oilfield pumping engine equipment magazine advertisement would display beautifully matted and framed.