1960's	1970's	1970's
1993	2002	2004	2007	2009
2009	2009	2012	2013	2015
2015	2015	2016	2016	2016
2017	2018	2018	2018	2019
until 2015	2015	after 2016

Mihailo Alić, researcher and collector, Belgrade, September 2021.

http://www.ultrahome.in.rs/crowncaps
http://crowncaps.info/collections/4946