Nice double censored WW II airmail cover from Sao Bento Sta. Porto (July 30 1943) w/ transits of Lisboa Aereo, Leopoldville (Aug 28), Inkisi (Aug 30)  to Kisantu, Belgian Congo. 

Belg Congo Censor tape @L

Franking includes 8 stamps totalling 13$75 paying the 12$00 second weight  (5 to 10 gram) air surcharge

Mundifil 2x530, 566, 3x572, 620, 623 - one stamp scuffed