These stamps were issued in 1974 to commemorate the centenary of the Universal Postal Union (UPU). The stamps depict the symbol of the UPU and the clock tower in Berne, Switzerland, site of the first International Postal Congress in 1874. At the congress a treaty was signed establishing the UPU, which enables free transit of mail throughout the world. New Zealand signed up to the UPU in 1892.
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New Zealand Post
Reference: 1974 Anniversaries stamp issue
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