The largest collection of glasses cases is owned by the Ruby Stain Museum. They have the largest collection of ruby stained glass and glasses cases in the world.
The largest stamp collection in the U.S. belongs to the American Philatelic Society. Most are in agreement that the WWF Conservation Stamp Collection is the largest stamp collection in the world.
The largest collection is probably in the hands of the DeBeers diamond organization.
The largest collection agency in the world is called "Encore Capital Group."
Jerry Seinfeld is rumored to own the largest Porsche collection in the world.
As of 2018, the world's largest bouncy ball collection belonged to Jeremy Telford, who owns over 1,300 different bouncy balls. His collection has been recognized by the Guinness World Records.
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No, they currently only have a record for the largest Potter collection overall.
The largest privately owned original album cover art collection is owned by Ernie Cefalu.
The Gold Museum (Museo del Oro) in Bogotá, Colombia has the largest collection of gold artifacts in the world, with over 55,000 pieces of gold and other materials from pre-Hispanic indigenous cultures.
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The online retailer Noble Pack claims that they have the largest collection of ring boxes available to sell in the world. They offer many different varieties and sizes on their website.
Paul Mawhinney, founder of Record-Rama in Pittsburgh, Pennsylvania is the current owner of the world's largest record collection with around 3 million vinyls to his name.