Three maps on folded sheet shows routes for Olympic Airlines, not dated, but believed to be c. 1980.  

Map when folded is 8-1/8 by 11-5/8 inches and opens to 16-1/4 by 11-5/8 inches, with center fold double the size of the front and back cover maps.  

Copyright by Rand McNally and was prepared by Esselte Map Service AB, Stockholm, Sweden.  

Neatly penned circle around island of Hydra on rear sheet map; otherwise, clean near excellent condition.