The year 2014 marked the 50th anniversary of the first year of operation of the Germany & Colonies Philatelic Society following the amalgamation of the Germany & Colonies Stamp Club (established 1947) and the Stockton German Study Group (1960).
The G&CPS celebrated its inaugural year in 1964 with the first Germania Posta philatelic exhibition held in Stockton.
I would be grateful for any information on the attached image. Is it a prepaid mourning cover? Any view on its rarity rating & value? Any simple literature ( I am an Aussie ) that covers these types of covers.