Bidspirit auction | Angola 1932-46 Ceres, new watermarked

Angola 1932-46 Ceres, new watermarked type. Registered envelope from Vila Luzo to England with transit in Luanda March 23, 1948, with pair of 50 c. light brown, Mf#236, stamp 2 Ang. violet Mf#243 and strip of 4 +1 stamps of 1$75 dark blue Mf#291, one of them with a defect. Unusual postage of 11$75 for registered letters by air mail.