Bidspirit auction | Portugal * Post Office Strike

Portugal * Post Office Strike * 1917/20 – Ceres. New colours and values. Set of three stamps: 4c green + 4c green, on a small piece + 1c brown and 4c green on a small piece, all in dotted paper, perforation 15x14, MF221 and 226, cancelled with three different marks, struck in black (the first) and violet (the second and third) “CONFEDERAÇÃO PATRONAL / LISBOA – PORTUGAL / GREVE / CORREIOS / 1920”. Stamps on the pieces with rust stains.