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.
By coincidence I just came across the following website on this subject
http://www.genealogienetz.de/reg/ESE/7burg-d.html -- and the bonus is it's in German and English. Very informative.