Ghent local in 1920

This self-addressed cover was sent from Ghent circa 9 August 1920. The cancel on the back is different from that on the front and indicates arrival on 10 August 1920. Although self-addressed, the cover actually went through the post office!

Characteristics: Unusual combination of 7 stamps Three 5c+5c and two 40c+40c, among other singles Total franking of 1F80c Registered (Gent-Gand 31) Cancel of arrival on back The bottom 5c+5c is discolored and has a round corner
Estimated value: $160 [Auctioned by Olivier Simons in March 2003]