Belgium, 1931 // 1937, group of 8 airmail covers, transit and arrival cds on back.

• 1931 Exhibition cds tying mixed franking of 1930 airmail 50 and cats of Arms 2c  locally posted.
• 1932 (Nov 28) First flight Antwerpen to London, 
• 1933 First flight Bruxelles to London
• 1933 (March 5) Bruxelles to Calcutta , air mail leg at Karachi was canceled (box cachet on front)
• 1935 Reg. airmail Bruxelles to Calcutta heavily franked.
• 1937 (Nov 12) Vise to Calcutta cover bearing full set of Prince Baudouin, airmail label 'cancelled' cachet showing the air leg was cancelled cover travelled by sea / train
• 1937 Bruxelles to Calcutta W KARACHI cancelled cachet.
• 1937 HALT postcard to Calcutta