Brass predecessor to aluminum

Postwar 1 Yen Transition

Connect the 1948 brass 1 yen to the 1955 aluminum young-tree type without duplicating the current-circulation canonical page.

戦後一円貨幣

Context

Historical and monetary setting

The brass type used a tachibana design and stopped production in 1950 as material costs rose. The aluminum successor entered circulation in 1955.

Identification

The brass predecessor is 20 mm and 3.2 g with a reeded edge; the aluminum successor is 20 mm and exactly 1.0 g with a smooth edge.

Evidence boundary

Full current-type annual mintages remain on the future modern-circulation workstream.

Series	Production	Legal issue	Material	Edge	Successor
Postwar 1 Yen Brass	1948	1948	copper	reeded	jp-current-1-yen-aluminum

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Evidence

These links support the claims on this page. Source authority does not imply permission to republish source images.

The history of the 1 yen Japan Mint

1914 Silver Yen production context, 1948 brass 1 yen, its 1950 production stop, and the 1955 aluminum successor.

Open source

Coins from the Meiji era onward Bank of Japan Currency Museum

Official specifications, first-issue years, legal-expiry dates, wartime and postwar regular types.

Open source