1953/56: sent from Vietnam Peace Committee to Austrian Peace Committee: production 1.000k., 2.000 K. (block-5) tied "HANOI 28-2 57" to air mail cover (vert. bend) to Vienna/Austria w. May 2 backstamp. Also regular issues Bai-Thuong dam 200d, a vertical top-margin pair tied HA-NOI 21 5 58" to air mail cover via China. (Tax Method: Regular Taxation)