Not much info is available on these caps. Unlike in Serbia, factory signs (FS) used on caps in Croatia and Slovenia have spanned several decades each, so precise dating based on FS is not possible. It appears that dedicated Christmas labels were not printed, so that method of dating also fails. On only one cap there appears brand name, so dating based on font type is also not possible (the font in question was used on labels and caps between 1970. and 1996). Font for the brand name appears to be the same from 1970's till 2003, but letter "č" has been slightly different between 1997. and 2003. Dating based on FS limits the use of these caps to period 1980. - 2002. with exception of 2 corked lined caps that are from early 1970's. Having elaborate collection of caps from this brewery, examining the lining also helps to distinguish caps issued prior to 2003, and those after, since former have foam-like liner, while newer have plastic / rubber type. Assumption that caps without text were used in the 1970's and 1980's, while those with Christmas greetings are from the 1990's is quite probable:
 

1970's	1970's	1980's	1980's	1980's
1980's	1980's	1990's	1990's	1990's
1990's