50 Years of 'Europa CEPT' Stamps on registered cover from Macedonia

I received registered cover from Macedonia with stamp from set 50 Years of 'Europa CEPT' Stamps, issued on 14.6.2005. I was lucky to receive this stamp on cover, cause this stamps are not valid anymore from 9.4.2019!

I received inside whole set, which is issued on two different sheets, small one with one set, and bigger one with 2 sets, which half you can see bellow.

Thank you, Dimitar!