may 3, 2015 a magic date for several million geocachers on this planet.
15 years ago it started. and now we have over 2,500,000 active caches.
explanation of the coin:
front: self-explanatory. along the edge you can see 15 holes with all years from 2001 throught 2015 it them, symbolizing the years passing.
back:word “congratulations, celectrations, jubilations” and the number 15. further: “the cachers”, ”the way and means”, “the caches” with concerning symbols.