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| 正面铭文 | 登录 以查看详情 |
| 背面描述 | Central device portrays an outline map of Hokkaido island rendered in horizontal line engraving, encircled by a flowing, undulating ribbon or wave-form surround that frames the cartographic motif. A commemorative legend in Chinese characters and Katakana script arcs along the upper periphery, reading 青函トンネル開通. The denomination ５００円 appears at lower left and the regnal date 昭和６３年 at lower right, both along the inner border. The entire design is enclosed within a beaded border consistent with the obverse. |
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| 背面铭文 | 青函トンネル開通 ５００円 昭和６３年 (Translation: Seikan tunnel opening 500 yen Year 63 of Shōwa) |
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| 铸币厂 | 登录 以查看详情 |
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| 附加信息 |
The Seikan Tunnel, completed in March 1988 after 24 years of construction and two catastrophic flooding incidents that killed 34 workers, connects Honshū to Hokkaidō beneath the Tsugaru Strait at a maximum depth of 240 meters below seabed — the deepest operational railway tunnel in the world at the time of opening. This commemorative was issued specifically to mark that completion, one of Japan's most technically demanding postwar infrastructure projects.