North Vietnam, Sea Snails, April 28th, 1970, Michel Nr. 610-613; Four stamps the nominals 12 xu (two stamps), 20 xu and 1 Dong were issued perforated 12.5:12 and…
Unified Vietnam, Sea Snails, December 30th, 1988, Michel Nr. 1958-1965, Block 64; Seven stamps in nominals of 10D (two stamps), 20D (two stamps), 30D (two stamps) and 50D…