JNDA#03-6
| Material | Cupronickel |
| Composition | Copper 750 Nickel 250 |
| Weight | 12grams=0.423oz |
| Diameter | 30mm=1.181in |
| Year of Production | 1976(Showa 51 year) |
This commemorative coin was issued in 1976 (Showa 51) to commemorate the 50th anniversary of Emperor Showa’s reign.
With a mintage of 70,000,000 coins—a relatively high number—it is relatively easy to obtain.
In terms of size, it is the same as the 100-yen white copper commemorative coin issued for the Sapporo Winter Olympics(1972 Sapporo Olympic 100 Yen Cupro-nickel Coin JNDA#03-4). The design features Nijubashi Bridge and the Imperial Palace on the obverse, and the Imperial Chrysanthemum crest flanked by phoenixes on the reverse.
| Year | Mintage | |
| 日本国 JAPAN 昭和51年 Showa51year 百円 100 Yen 御在位五十年(The Emperor has reigned for 50 years) | 1976 | 70,000,000 |
