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← 1987 SHŌWA 1 YEN
WORLD COINS - JAPAN - 1 YEN - PROOF

1987 Japan 1 Yen Proof — Shōwa 62

Collector Proof variety · Quantity requires separate official confirmation

01 IDENTITY

Coin Identity

CountryJapan
Denomination1 Yen
Year1987
Japanese EraShōwa 62
Date Inscription昭和六十二年
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; secondary]
EdgeSmooth / plain
FinishProof: specialized collector manufacturing process; see Japan Mint FAQ
03 DESIGN & CONTEXT

Design & Collector Issue

Young Tree Design

The Proof variety uses the established Japanese aluminum 1 Yen design bearing the young-tree motif.

Proof Finish

Proof describes a collector-oriented surface and striking process, not a different calendar year or new monetary denomination.

Collector Issue Caution

The Numista Proof listing is retained as a separate variety. The cited Japan Mint annual table does not isolate this Proof quantity. Do not treat the Proof count as verified by that primary table or add it to the year-dated production figure.

04 ISSUE & MINTAGE

Proof Issue Information

Reported Proof Quantity230,000 coins [Numista N#1590; secondary]
Official Proof Quantity VerificationPending — separate year/finish proof quantity not confirmed from Japan Mint
Official Year-dated Aluminum 1 Yen Quantity958,520,000 coins [Japan Mint; NOT Proof-exclusive]
Double-count CautionThe above figures are not necessarily additive.

This Proof quantity comes from a secondary catalogue entry in the supplied source. Japan Mint is cited as Reference 01 for official annual production, but that publication does not separately substantiate the Proof listing.

05 COLLECTION RECORD

Archive Information

Archive IDJP-1Y-1987-SHOWA-AL-PROOF
Coin Codejp1y87sp
QR Short Codejp1y87sp
QR Short URLhttps://metacoinart.com/q/jp1y87sp
Canonical Path/world-coins/japan/1-yen/1955-1989-showa/1987/proof/
Catalogue Cross-checkNumista N#1590 (Proof variety)
Archive StatusSource documented; official Proof count needs direct primary verification
06 SOURCES & REFERENCES

References

01 — PRIMARY OFFICIAL PRODUCTION SOURCE

Japan Mint — Coins Manufactured by Year and Denomination

Japan Mint primary manufacturing count for Shōwa 62 (1987); the table gives the year-dated 1 Yen aluminum amount, not a separate breakdown by collector finish.

Open reference

02 — OFFICIAL HISTORICAL SOURCE

Japan Mint — A History of the 1 Yen Coin

Japan Mint historical account: the 1 Yen aluminum coin entered circulation in 1955 after a public design competition and uses a 20 mm, 1 g format.

Open reference

03 — OFFICIAL SPECIFICATION SOURCE

Bank of Japan — Notes and Coins Currently Issued

Bank of Japan identifies the current aluminum 1 Yen coin as 100% aluminum, 20.0 mm in diameter, 1.0 g, smooth edged and bearing the young-tree design.

Open reference

04 — SECONDARY NUMISMATIC CROSS-CHECK

Numista — Japan 1 Yen, Shōwa (N#1590)

Catalogue listing for Shōwa years, inscriptions, 1.2 mm reported thickness, and the 1987/1988 Proof variety entries. No Numista photographs, valuations, logos or catalogue prose are copied.

Open reference

05 — OFFICIAL PROOF PROCESS CONTEXT

Japan Mint — Coin FAQ (Proof Coins)

Japan Mint explains the definition and special manufacturing process of collector Proof coins; this reference does not independently confirm a 1987/1988 variety production quantity.

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 provided as identified references only.