I believe the first printing of Diplomacy was in 1959.
Great game. I run PBEM games using a free adjudicator called JDip. IMO it is a better game by email then live. In PBEM you not only don’t know what moves are coming you don’t even know who is making deals. Very fun.
Look here for an example of the maps JDip kicks out.
http://Thudwar.tripod.com