Stamp: Angola, Centenary of Carlos Viegas Gago Coutinho (1869–1969), face value 2$50 (Escudos), issued in 17.02.1969.
Postmark: Circular date stamp “TELEGRAFOS / ANGOLA / VILA GAGO COUTINHO – 17.FEV.1969”
Postcard: Commemorative postcard dedicated to Carlos Viegas Gago Coutinho (1869–1969). An illustration of “LANCHA CANHONEIRA ‘LOIGE’. Edition unknow
Concordance:
Thematic: Excellent thematic concordance. The stamp commemorates the centenary of Gago Coutinho, depicting a vessel related to his African hydrographic missions. The postcard shows the launch “Loige,” the first vessel he commanded, directly reinforcing the thematic focus on his naval and scientific career.
Geographic: Strong geographic concordance. The postmark originates from Vila Gago Coutinho, a toponym adopted in honor of the navigator and located in the region where he conducted part of his cartographic work. Both the stamp and postcard refer to Africa and to the missions linked to Gago Coutinho, ensuring geographic alignment.
Temporal: Full temporal concordance. The cancellation dated 1 February 1969 occurs in the exact centenary year of Gago Coutinho’s birth (1869–1969) and within the correct postal validity period of the commemorative stamp.

