around the world with ipuenktchen

here you may have a look at the lucky countries, which had done issues of special postcrossing stamps, and even some of them twice:

14.10.2011 the netherlands
09.09.2013 finland
05.10.2013 letony
02.01.2014 weißrussland
28.05.2014 guernsey
25.01.2015 russia
29.05.2015 slowenia
02.09.2015 czech rep
09.10.2015 ukraine
07.11.2015 kasachstan
23.12.2015 bulgaria
25.03.2016 russia
29.03.2016 the netherlands
21.05.2016 austria
14.07.2016 poland
14.07.2016 guernsey
03.01.2017 weißrussland
24.02.2017 romania
.........2017 ireland
.........2017 Suisse