From Liège to Verviers in 1919

This is the front part of a cover sent from Liège on 3 November 1919 to Verviers.
This is presumably a fragment of a large envelope with heavy contents, for which the postage was relatively high.

Characteristics: 15c+15c in block of 10 and in pair Total franking of 1F80c Largest used block of 15c+15c known Front only - missing rest of the envelope Nice calligraphy
Estimated value: $50 [Auctioned by Olivier Simons in August 2006]