I have already researched evolution of graphical designs on serbian crown caps. Now I am reporting similar trends on a major Croatian beer, which is no surpise since they are all owned by global mega-companies.This is the story of 2 most sold beer brands in Serbia and Croatia, two neighbouring countries of people who speak the same language, and share common history of migrating to their present location in 7th century C.E. The brands are Zajecarsko and Ozujsko. The similar story can be told about Jelen and Lav brands, but not regarding the word "beer", but regarding disappearance of the respected trademark animal (deer for Jelen, lion for Lav) from the cap / label. Interesting thing is also that all 4 changes happened in the similar time frame. So lets look at the illustrations of this change.
The word "pivo" ("beer") first becomes a wavy line, and then it disappears:

The word "pivo" first becomes smaller, then it disappears:

The lion first becomes cropped to a head, then smaller, and then it disappears:

The deer changes from an image to an outline, and then it is gone:

The same happened with Niško beer:

It is obviously the method of incremental change: the word, or the graphical symbol / animal first gets smaller before it disappears totally, and forever.
Mihailo
Alić, researcher and collector, Belgrade, July 2021.
http://www.ultrahome.in.rs/crowncaps
http://crowncaps.info/collections/4946