1989–2019 Japan 1 Yen — Heisei Aluminum Type
Heisei 1–31 · Young Tree · 31 calendar years · Standard and Proof records separated
Select a Year
Every calendar year has an independent standard-issue page and a dedicated Proof record. Years marked In set only* follow the supplied Numista catalogue classification and are identified as secondary-source status rather than Japan Mint terminology.
Heisei Aluminum 1 Yen
The Heisei 1 Yen continues the 100% aluminum, 20 mm, 1 g young-tree type introduced in 1955. Japan Mint historical material records extraordinary 1 Yen demand around the 1989 consumption-tax introduction and very high manufacturing volumes in the early Heisei years, followed by a long decline in demand.
Official Sources & Catalogue Cross-check
Japan Mint — Coins Manufactured by Year and Denomination
Japan Mint year-dated manufacturing table for Heisei 1 (1989). The official table is the primary quantity source used by this archive and is published in units of thousands of coins.
Japan Mint — A History of the 1 Yen Coin
Japan Mint historical material describes the aluminum 1 Yen coin, the Heisei-era surge in demand around the consumption-tax introduction, and the later decline in manufacturing demand.
Bank of Japan — Notes and Coins Currently Issued
Bank of Japan specifies the aluminum 1 Yen as 100% aluminum, 20.0 mm in diameter, 1.0 g in weight, with a plain edge and the young-tree design.
Numista — Japan 1 Yen, Heisei (N#983)
Secondary catalogue cross-check for Heisei dates, standard-issue entries, Proof entries, 1.2 mm reported thickness and catalogue identifiers. No Numista photographs, valuation table, logo or catalogue prose is reproduced.
Japan Mint is the primary source for year-dated manufacturing totals. Numista N#983 is retained only as a secondary cross-check for standard-issue and Proof catalogue entries. Because official year totals and secondary finish-specific quantities do not use a consistently identical scope across the whole period, the archive never assumes that standard and Proof figures are automatically additive.
Important review flags: several years reconcile numerically between the official total and supplied standard-plus-Proof entries, while other years do not. 2014–2019 Proof rows in the supplied Numista table do not state a Proof quantity. Each year page records the exact source relationship instead of silently forcing a match.