Portugal 1956 Birth Centenary of Ferreira da Silva

=Description=
 * Issue Date: 03-05-1956
 * Withdrawn: 31-08-1959
 * Designed by: Pinto, Cândido Costa
 * Engraving: 
 * Printed by: Casa da Moeda
 * Print Process: Offset
 * Paper: Enamel
 * Width: mm
 * Height: mm
 * Perforations: 13½
 * Format: Sheet of 10x10

=Stamps=

António Joaquim Ferreira da Silva (July 28, 1853 - August 23, 1923)Portuguese chemist, and one of the greatest exponents of Portuguese science.Was the first president of the Portuguese Society of Chemistry

=Print run=

=First Day Cover=

Postmarks: Lisboa, Porto

=Data Serie=


 * AF-Afinsa (Portugal & former Colonies)
 * SC-Scott
 * MI-Mitchel
 * YT-Yvert et Tellier
 * NVPH-Dutch Catalogue
 * SG-Stanley Gibbons