1952 – 13th U.P.U. Congress Brussels – Tour and Tassis – Complete Series COB 880–891 – MNH The lot includes the complete 1952 Belgian stamp series issued for the 13th Congress of the Universal Postal Union (U.P.U.) in Brussels, COB 880–891, 12 stamps. The entire series is in MNH condition, with no visible traces of hinging. The photographs of both the front and reverse sides are an integral part of the description. Since collectors may use different criteria when assessing gum condition, centering, perforations and overall preservation, please examine all photographs carefully and make your own assessment of the condition before placing a bid.