Etterbeek to Mansfield (Pennsylvania, USA) in 1920

This registered cover was sent from Etterbeek to Mansfield, Pennsylvania (USA) on 5 July 1920, barely a month before the Red Cross stamps were taken out of circulation.
See a very similar cover with the same brown envelope, same handwriting and same destination but sent from Brussels.

Characteristics: Featuring the 10c+10c and 15c+15c of the Red Cross series and a colorful array of other stamps (Scott 126, 130, 131, B48 and B50) Total franking = 1F10c (excessive postage) Registered cover (Etterbeek 1) Foreign destination No cancel of arrival Horizontal folding line across bottom, not affecting stamps Hinge marks on back
Estimated value: $150 [Auctioned by David Delhaye in November 2004]