Original vintage oil and gas magazine ad, PENNSYLVANIA TANK CAR COMPANY of Sharon, PA.  A Challenge to Weather and to Wear.  They roll steadily onward thru all kinds of weather.  Pennsylvania railroad tank cars.  Old 1921 dated petroleum refining industry advertisement.  (The scan shows a slight pink tint that is not in the actual ad.) 

On the reverse side (see Additional Images tab) are fractional page ads for AMERICAN OIL CORPORATION of Jackson, MI.  Advance greases for Your Private Brand.  DUNN MANUFACTURING COMPANY of Exnard, CA.  This Appliance Should Be Regular Equipment in Every Pumping Well.  Dunn Tools.    Old petroleum refining industry advertisement.

Approximate size  9  x 12 inches.