Railway Post Offices of Guatemala During Post WW2 Exhibit - A 27 page exhibit describing and displaying all routes that were in service during the post WW2 period. There are about 100 postmarks with a dial indicating date and the fact that it was a R.P.O.(ambulante), and part of the the dial cancel was four lines depicting car numbers and terminals. Unique and clean! Ex-William Harris. (Est $400-500) (Image)