From Sainte-Adresse to Chamalières (France) in 1918

This registered cover was sent on 7 November 1918 from Sainte-Adresse, in France where the Belgian Government was in exile, to Chamalières near Puy du Dôme in France, where it arrived two days later.
For reference, the armistice marking the end World War I hostilities was signed on 11 November 1918.

Characteristics: Featuring the 50c+50c accompanied by the 2c+2c in a block of four (total postage of 58c, exact franking?) Registered cover (Label "Ste-Adresse - Poste militaire belge) Technically foreign destination (not geographically!) Cancel of arrival on back
Estimated value: $140 [Auctioned by David Delhaye in October 2007]