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← 1989–2019 HEISEI 1 YEN
WORLD COINS - JAPAN - 1 YEN - STANDARD ISSUE

2011 Japan 1 Yen — Heisei 23

Aluminum · Young Tree Type · Standard and Proof records separated

01 IDENTITY

Coin Identity

CountryJapan
Denomination1 Yen
Calendar Year2011
Japanese EraHeisei 23
Date Inscription平成二十三年
Coin TypeYoung Tree Aluminum 1 Yen
Issue FormatIn set only [Numista; secondary catalogue status]
Minting AuthorityJapan Mint
02 PHYSICAL PROFILE

Physical Specifications

Composition100% Aluminum [Bank of Japan]
Nominal Weight1.0 g [Bank of Japan]
Diameter20.0 mm [Bank of Japan]
Thickness1.2 mm [Numista N#983; secondary]
ShapeRound
EdgePlain / smooth
03 DESIGN & CONTEXT

Design & Historical Context

Young Tree Side

The established 1 Yen design uses the young-tree motif selected through the postwar public design process.

Date Side

The reverse carries the large numeral 1 and the Heisei-era date inscription 平成二十三年.

Heisei Context

Japan Mint historical material records a major increase in 1 Yen demand around the introduction of consumption tax in 1989. Production later declined as coin demand and payment habits changed.

Artwork & Rights Note

Only independently composed archive text is presented. No third-party Numista coin photograph, valuation table, logo or copyrighted catalogue illustration is reproduced.

04 ISSUE & MINTAGE

Issue Information

Calendar Year2011
Japanese DateHeisei 23 (平成二十三年)
Japan Mint Year-dated Production456,000 coins [official primary source]
Numista Standard Issue500,000 coins [N#983; secondary]
Numista Proof Entry108,000 coins [supplied Numista table; secondary]
Count Cross-checkDISCREPANCY
Japan Mint Source UnitThousands of coins in PDF; multiplied by 1,000
Proof RecordOpen 2011 Proof record

DISCREPANCY — Japan Mint official year-dated production is 456,000; supplied Numista standard issue is 500,000; supplied Proof 108,000. Official Japan Mint data remains primary. Difference versus standard issue: -44,000.

05 COLLECTION RECORD

Archive Information

Archive IDJP-1Y-2011-HEISEI-AL
Coin Codejp1y11h
QR Short Codejp1y11h
QR Short URLhttps://metacoinart.com/q/jp1y11h
Canonical Path/world-coins/japan/1-yen/1989-2019-heisei/2011/
Catalogue Cross-checkNumista N#983 · Y#95 · JNDA#02-13 · Schön#72
Archive StatusOfficial year total documented; secondary finish entries preserved separately
06 SOURCES & REFERENCES

References

01 — PRIMARY OFFICIAL PRODUCTION SOURCE

Japan Mint — Coins Manufactured by Year and Denomination

Japan Mint year-dated manufacturing table for Heisei 23 (2011). The official table is the primary quantity source used by this archive and is published in units of thousands of coins.

Open reference

02 — OFFICIAL HISTORICAL SOURCE

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.

Open reference

03 — OFFICIAL SPECIFICATION SOURCE

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.

Open reference

04 — SECONDARY NUMISMATIC CROSS-CHECK

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.

Open reference

Independent research archive. ALL THAT CURRENCY is not affiliated with, endorsed by, or sponsored by Japan Mint, Bank of Japan, or Numista. External sources are linked only as identified references.