Bidspirit auction | Angola. Ceres issue of 1921

Angola. Ceres issue of 1921 - new colors. Registered Letter from Luanda dated ?.?-1928, Mark R and handwritten number, postage of 3$00, (stamp of 2$00 CE211, perforation 15x14 and of 1$00 CE 210), by Lisbon on 20.8 and arrival on 24.8. Difference in the ANGOLA printing, in the two rates. Sent by steamship Mozambique.