1916–1924 Taishō Paulownia Bronze Type
Taishō 5–13 · Individual year records
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Taishō 1 Sen Bronze Issue
Japan Mint's institutional history describes a 1916 redesign and reduction in the size and weight of the 1 Sen and 5 Rin bronze coins. The Bank of Japan Currency Museum lists the bronze 1 Sen standard as 23.03 mm in diameter, 3.75 g in weight, and 95% copper, 4% tin and 1% zinc. Each listed annual mintage is independently attributed to Numista N#5434 until confirmed against an official year-level mint record.
Source Hierarchy
Japan Mint — 150 Years of History
Historical background for the 1916 bronze reform and changed coin design, not a year-specific mintage verification.
Bank of Japan — Coins since the Meiji Era
Official specifications and 1916 type introduction. The relevant row appears on printed page 2 of the PDF.
Numista — Japan 1 Sen Taishō (N#5434)
Reported mintage for each year 1916–1924 and secondary catalogue identifiers. No images, logos, valuations, or prose from Numista are reproduced.