Sc. 1004 - 10/9/74 - 2s deep claret & lilac
Two 4-wheel mail cars, 1874 - UPU Centenary Issue

Notes on back of this page:
Stamp designer - Adalbert Pilch
Recess printed by Austrian State Printing Works
3.2 Million copies produced

The UPU is a popular subject on stamps, and rightly so -
Here is a page about the topic.

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