VIAGEM AEREA LISBOA- BRASIL
POR GAGO COUTINHO E SACADURA CABRAL
PARTIDA DE LISBOA EM 30-3-1922
CHEGADA AO RIO DE JANEIRO EM 17-6-1922
A CÂMARA MUNICIPAL DE CASCAIS MANDOU COLOCAR ESTA LAPIDE SESSÃO DE 22 DE ABRIL DE 1923

The flight, made by Portuguese seaplane pilots Gago Coutinho and Sacadura Freire Cabral, was made in 1922 to mark the 100th anniversary of Brazil’s independence. The flight was between Lisbon and Rio de Janeiro.
The flight, which was held in three stages, started at the airport near the Belen Tower

The monument in the yard of the Maritime Museum was photographed on the same day Click for a larger image

The model of the plane in which the two flew, is displayed in a monument in Lisbon near the place where they took off Click for sign's details

Translation of the text on the sign:
AIR TRAVEL LISBON- BRAZIL
BY GAGO COUTINHO AND SACADURA CABRAL
DEPARTURE FROM LISBON ON 30-3-1922
ARRIVAL IN RIO DE JANEIRO ON 17-6-1922
THE TOWN HALL OF CASCAIS ORDERED THIS TOMB PLACED AT THE SESSION OF APRIL 22, 1923