Bieretiketten.nl

Dutch collector site by and for collectors — breweries, beer map, crown caps and labels.

CrownCaps.info

Extensive crown cap database with thousands of caps and brand information.

BottleCaps.de

German collector site with a large database of crown caps from around the world.

BottleCapClub.org

International community of collectors, trading events and forums about crown caps.

Forum Motive

Forum about crown cap motifs, rare caps and themed collections.