Very fine and interesting set of over 400 letters, mainly from the 20th century, including the pre-war period, often addressed to Madame de Bruyer in Oran (Algeria) and originating in France. We find taxed letters, good values (orphan n°150/151, unemployed...), censures, postal stationery, registered letters, pneumatic, vignettes, PA (including first flights) by couriers Paris-Hanoi, 1929, raid interrupted by accident).