The Marx Sinclair tanker was a refresh of the earlier and more common Marx 553 Middle States Oil tanker, a design that originated way back in 1935. The Sinclair tanker made the old design book newer, and perhaps more relevant for its era. It came in two major variants, one much easier to find than the other. It dates to 1956 and 1957.
David Farquhar is a computer security professional, entrepreneur, and author. He started his career as a part-time computer technician in 1994, worked his way up to system administrator by 1997, and has specialized in vulnerability management since 2013. He invests in real estate on the side and his hobbies include O gauge trains, baseball cards, and retro computers and video games. A University of Missouri graduate, he holds CISSP and Security+ certifications. He lives in St. Louis with his family.