Product Name: Pattern Coin, Showa Year 25, 1-Yen Bronze Coin Weight: 2.8g Diameter: 19.0mm Description: ・This is a pattern coin of a Showa Year 25, 1-Yen bronze coin. A pattern coin is a sample coin that is scheduled to be issued. ・I found it while looking at the 33rd Ginza Coin auction. See image 5. 1. Pattern Coin, Bronze Coin Weight 2.8g Diameter 19mm ・Matches the item for sale. 2. Circulating Coin, Brass Coin Weight 3.3g Diameter 20mm See images 6 and 7. ・There is a difference between the pattern coin and the circulating coin. Especially the weight, there is a difference of 0.5g. Since it matches the item for sale, it is a pattern coin. ・I researched the value. It was 520,000 yen without a certificate at the 33rd Ginza Coin auction. See image 5. It is said that there are only a few pattern coins. Also, the purchase price at Arimado is 340,000 yen. I will use this price as a benchmark. There is even a purchase price table, so I think there are a few of them.