I don't really know much about it, beyond the basic idea that it's a role-playing game about agriculture and development. It was developed as a teaching tool in the 1970s by Graham Chapman from Cambridge. You can read a piece by him in Area from 1973 about how the game was developed, how it works, and its purpose here.
You can read a brief piece from the New York Times in 1982 about how the game was being used at the World Bank here.
Pics below.
Email me at kurt.iveson@sydney.edu.au if want it. I'm not charging for the object, but will need you to pay for postage (which might not be cheap, given its size and weight). First in, best dressed...