Portugal 1955 Centenary of Electric Telegraph System in Portugal

= Description =
 * Issue Date: 16-09-1955
 * Withdrawn: 31-10-1958
 * 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=

=Print run=

=First Day Cover=

Postmarks: Lisboa, Porto

=Catalogues=


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