South Vietnam; 25 Years World Health Organization. December 31st, 1974, Michel Nr. SVN 542-543; Two stamps with nominals of 8D and 15D were issued in perforation 12.5:12.
Here is the mint set.
These stamps were not officially released imperforate, however, a small number of imperforate trial proofs have come to market. Here is the imperforate set.
Registration Nr. 201335
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