In 1985 Cambodia issued a set of 7 stamps to celebrate the international philatelic exposition of Argentina'85 held in Bueno Aires. It is a thematic set on threatened species of birds found in Argentina.
For most collectors this may just be another pictorial issue, but for specialists of Cambodian philately there is a little more.
Throughout the 1980s, Cambodia was represented by COPREFIL to participate in a number of international philatelic exhibitions for promoting philatelic sales. This Argentina'85 FDC set consists of 3 covers, below I illustrate one of them:
In the spotlight is the first day commemorative postmark, this is probably the only one in Cambodian philatelic history with absolutely no Khmer words. It is totally in French: "Exposition Philatelique Argentina'85, Kampuchea Premier Jour 5-7-85".
Cambodian first day commemorative postmarks are either in Khmer or a mix of Khmer and French or English, this one is the odd.
During the 10 day exhibition, a commemorative cachet was available at the exhibition venue for application on covers at a small fee. This cachet is bilingual, in Khmer and French. The Khmer reads: "Philatelic Exposition Argentina'85". In French it repeats the same meaning plus the dates of exhibition, 5-14 Juil /85 and the country name "Kampuchea".