Indochina, Air Mail Stamps with Inscription “RF”, June 13th, 1949, Michel Nr. 358-359; Two additional air mail stamps with high nominals of 20P and 30P were issued in perforation 13.5. These stamps were most often used on large commercial envelopes or packages. As a result postal use of these stamps is rare and hard to document these days.
Here is the mint never hinged set in vertical gutter pairs.
Mixed franking of the 5P, 20P (2) and 30P Air Mail stamps together with stamps from the Domestic Scences II stamps and paying an overall postage of 79.20P on an international air mail letter sent from Saigon to France.
Registration Nr. 090570