- The Australian Beer Cap Collection
- Presents beer cap collection of the hobbyist with site history, profiler of the owner, and data collection updates.
- Bottle Cap Index
- Shows directory list of collectors and hobbyists of bottle caps with news updates and search engines.
- Bottle Cap Man
- Features the site with collection of bottle caps with item updates, descriptions, and images. Includes profiler and other collectibles of the hobbyist.
- Celestial Crown Cap
- Convenes information related to crown caps collecting. Details trade, sets, series, and photos.
- Crown Caps
- Information about crown caps, collectors, beverage advertisements, and photos. Includes themes, time series, links, trades and special sets.
- Crowns for You
- Learn about the collector, bottle caps collection, trade, trading partner, collectors list and links.
- Homepage Wim Spijker
- Lists different kinds of bottle caps with image caps, items updates, and profiler of the collector.
- PlopSite.de
- Promotes stoppers and ceramic bottle cap collections in different countries with contact details.
- Udo’s Page
- Showcases a collection of beer caps and sodas with profile of the collector.
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