India 1933-41 Correspondence in 49 covers to Switzerland 12 with censors

Appears to be a family correspondence with letters written in German to Altendorf in Switzerland a number sent by airmail mostly posted from Calcutta some WWII period with various different censor markings most from Calcutta but different types seen. Also incl two 1951 covers to same address. Mixed condition most with clear postmarks and arrival marks.