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A pumpjack (known by many nicknames such as Nodding Donkey or Thirsty Bird) is the overground drive for an underground oil well pump. A characteristic sight on oil fields since late in the 19th century, it makes for an ideal objective markers for wargames, whether modern, WWII or earlier.
This model consists of four pumps on a sprue. It is a generic pumpjack design, not based on any specific prototype.