Brussels local in 1919

This cover was sent from Brussels-6 on 6 August 1919 to Brussels-1 where it arrived an hour later. The square block of 25 is the largest known used block of 1918 Red Cross stamps.

Characteristics: 2c+2c in jumbo block of 25 with sheet margin Total franking = 50c Cancel of arrival on back Nice calligraphy; clear cancels Major vertical fold, but not touching the stamps Minor rust spots in the margin One stamp on lower edge with cropped corner
Estimated value: $35 [Auctioned by Van Looy & Van Looy in June 2004]