This is a great find. It is an ESSO Fuel Tanker from Fast Wheeling. These were inexpensive toys that primarily ended up in the hands of children....as they were meant to be. However, because of that they have become sought after by collectors because there are so few left, particularly in the original packaging. 

Released 30+ years ago, the truck is Mint/Unopened and the blistercard shows some of its age. If you collect Esso/Exxon, Fuel Trucks or Vintage toys this is a great find that most other collectors just won't own! (1:64 Scale)