In addition to the medallions made at the Japan Mint, there is a large variety of
privately-made medals. These are usually large and heavy
Here are a few examples.
20th Anniversary of the Return of Okinawa to Japan
63rd Anniversary of the Showa Emperor being on the throne 
Wedding of the Crown Prince Commemorative. Heisei 5 
1st Anniversary of the Heisei Emperor being on the throne 
Taiwan Domestic Goods Exhibition.
Taisho 5 .
Designed by Shoukichi Hata.
Taiwan Athletic Meet.
Awarded to Ono Jiro for hihis record in the
100 meter swim. Dated Showa 9 .
Blackened bronze table medal. 'Aichi Prefecture Rice Inspection
Association 15th Anniversary Commemorative, Sponsored by Aichi
Prefecture Agricultural Association, Showa 2  October.'
Very thick and heavy gilt table medal.
Inscribed 'Merit Award, Imperial Enthronement Celebration, Nagoya
exhibition, Showa 3  November.'
Case reads 'Merit Award.'
Inscribed on obverse: 'Kyoto. Domestic Industrial Goods Exhibition. Meiji 28 .'
On reverse: 'Merit. 2555th Imperial Year of the Jimmu Emperor .'
Inscribed on obverse: 'Domestic Industrial Goods Exhibition. Meiji 34  September.'
On reverse: 'Merit. 2562th Imperial Year of the Jimmu Emperor .'
Inscribed on obverse: 'Special Award.'
On reverse: 'Municipal Establishment Commemorative. Ibaraki Special Goods Exhibition
Showa 12  April. Sponsored by Ibaraki City Ward and Ibaraki Industrial Association.'
Diameter: about 6 cm.