VIETNAM (NORTH) - Czechoslovakia. 1955 Angkor picture postcard, franked with surcharged 10d/100d brown (black surcharge type I), 20d/200d red (black Gothic numerals) in addition to imperforate 150d Dien-Bien-Phu issue. All cancelled by HA-NOI c.d.s. Very rare commercial usage of surcharged stamps in good condition. Michel 14B,18bI,21IaI. (Photo). Est. 300 - 400 CHF.