The Salvation Army centenary in Belgium was commemorated on the Christmas stamp issued 18 November 1989. Here is a lux Sonstamp FD Sheet which was issued in a limited edition of 500. This is the French version (Noel), note that this is no. 001!
One of the Guernsey stamps in the “Stories from the Great War” set pictured the Salvation Army volunteer Ada Le Poidevin. The cover above with single stamp is an unofficial cover issued by Rob Kinnon-Brettle (Kinnon Covers). He persuaded the post office to cancel with the official First Day of Issue postmark. Limited edition – only 50 covers were issued!!! Below is the official FDC with full set shown.