- This rare set of three Belgian stamps features the portrait of King Leopold III and was issued between 1936 and 1969. The stamps are in Gem grade and have been certified by Briefmarkenprufstelle Basel. The block height is one stamp and the block width is two stamps. These stamps are perfect for collectors and enthusiasts who are looking for unique items to add to their collection. The cancellation type is machine cancel and the stamps are in red and brown colours. The denomination of the stamps is 0.80 - 1 frank and 10 franks. This set of stamps is a great representation of the Belgian era and is a must-have for any stamp collector.