BENIN French colony, 1892 - VERY RARE BLOCK OF SIX STAMPS. 30c brown Alphée Dubois type of the general colonies in a block of 6 stamps each with a round date stamp, excellent marking COTONOU BENIN 14 june 1892 (see specialized part Yvert tome 2 / 2017 page 86 and take into account the very important surplus value for this block).