This stamps/coins/phonecards site is unique and comprehensive, cross-referenced, and a great resource for collectors of judo items.
Kindly peruse the stamp site. It’s well connected, with over 4,000 images of stamps, coins, and phonecards, and includes a sampling of 30 other martial arts. But it’s mostly about judo. It gets a lot of attention, is not political or a business. It’s a true resource, an educational beacon, and just fun to see stuff we do depicted on a thumb-size mat! Some stamps are beautiful. Others just mention judo or show a logo. But so much is there.