Info in
this Link:
"of note is the fact that some pilots painted on their machines the Portuguese colours, either by modifying the French cocardes (just a matter of painting the inner blue and white circle in green, since the outer ring was red), or by adding diagonal red and green stripes over the rear fuselage, such as used by Santos Leite, Sousa Maya and Lelo Portela on their SPAD S.13 C1, along with the Jeanne d'Arc insignia of Escadrille SPA 124, that replaced Lafayette Escadrille, to which these pilots belonged."
Maybe some references of utility:
Avions N° 96. Mars 2001. Article: 14/18 : Lello Portela ,un chasseur portugais au service de la France. Authors: Lopes, Mário Canongia - Cony, Christophe.
Windsock Volume 9 Number 4.
Colour profile on rear cover SPAD VII S.5721 Lt Alberto Lello Portela Spa.124 Diagonal white band cowl. Portuguese pennant & cockade.
Greetings!!

Dario