I have had a lucky find today and picked up a pristine 1971 copy of Diplomacy. The pieces are still stapled in the and the box and board are immaculate. However the pink pieces have been substituted for beige. (see pic)
I have a copy of the same vintage with the same unit colours - not a misprint - there have been loads of different colour schemes in dozens of different countries in the half century that has passed since Diplomacy came out.