NABA 1971 Basel Stamp Show

The National Postage Stamp Exhibition was held in Basel, Switzerland 4^th to 13^th June 1971, known as NABA 1971. This show is held every six years. Designed by Adolf  Fluckiger shows the Rayon II stamp, and a basilisk, Basel’s emblem. The four-stamp minisheet on the cover is very impressive. Maria sent me this cover.