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.
Can anyone tell me why the Germania 15pf yellow-brown of 1916 was changed to 15pf slate-violet, in may 1917, and further changed to 15pf brown -purple in January 1920.
