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← 2018 HEISEI 1 YEN
WORLD COINS - JAPAN - 1 YEN - PROOF

2018 Japan 1 Yen Proof — Heisei 30

Collector Proof record · Secondary quantity separated from official annual production

01 IDENTITY

Coin Identity

CountryJapan
Denomination1 Yen
Year2018
Japanese EraHeisei 30
Date Inscription平成三十年
FinishProof (collector finish)
Minting AuthorityJapan Mint
Coin TypeYoung Tree Aluminum 1 Yen
02 PHYSICAL PROFILE

Physical Specifications

Composition100% Aluminum [Bank of Japan type specification]
Nominal Weight1.0 g [Bank of Japan type specification]
Diameter20.0 mm [Bank of Japan type specification]
Thickness1.2 mm [Numista N#983; secondary]
EdgePlain / smooth
FinishProof: collector-oriented manufacturing process; see Japan Mint FAQ
03 DESIGN & CONTEXT

Design & Collector Issue

Young Tree Design

The Proof record uses the established aluminum 1 Yen young-tree design and the Heisei date 平成三十年.

Proof Finish

Proof refers to a collector-oriented manufacturing process, not a different denomination or calendar year.

Collector Issue Caution

The supplied Numista table identifies a Proof entry for this year. Japan Mint's annual year-dated production table is not treated here as a finish-exclusive Proof count. The archive therefore keeps the Proof record separate and avoids automatic addition or subtraction.

04 ISSUE & MINTAGE

Proof Issue Information

Numista Proof EntryPresent [N#983; secondary]
Reported Proof QuantityNot stated in supplied Numista table
Numista Proof Frequency0.18%
Japan Mint Year-dated 1 Yen Production440,000 coins [official; not Proof-exclusive]
Numista Standard Issue440,000 coins [secondary]
Official Proof Quantity VerificationNot isolated by the annual Japan Mint source used here

MATCH — Japan Mint official year-dated production and the supplied Numista standard-issue figure are the same. The supplied proof entry has no quantity.

05 COLLECTION RECORD

Archive Information

Archive IDJP-1Y-2018-HEISEI-AL-PROOF
Coin Codejp1y18hp
QR Short Codejp1y18hp
QR Short URLhttps://metacoinart.com/q/jp1y18hp
Canonical Path/world-coins/japan/1-yen/1989-2019-heisei/2018/proof/
Catalogue Cross-checkNumista N#983 (Proof entry) · Y#95 · JNDA#02-13
Archive StatusProof existence documented; finish-specific official quantity requires separate primary confirmation
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 30 (2018). 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

05 — OFFICIAL PROOF PROCESS CONTEXT

Japan Mint — Coin FAQ (Proof Coins)

Japan Mint explains Proof coins as collector products manufactured with a specialized process. This reference is used for Proof-process context and does not independently establish the year-specific Proof quantity shown by a secondary catalogue.

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.