Representative issue study
Showa 23 (1948) 1 Yen Brass
The brass 1 Yen is the direct postwar predecessor to the current aluminum family.
昭和二十三年一円黄銅貨
- Date
- 昭和二十三年 (1948)
- Denomination
- 1 Yen
- Material
- brass
- Issue class
- postwar-transitional
Context
Historical and monetary setting
It filled a new low-yen role as sen purchasing power collapsed.
Identification
How to classify the object
Confirm reeded edge, mass, diameter, brass surface, date, and characters.
Evidence boundary
What this page does not claim
Do not duplicate the modern aluminum 1 Yen series.
Issue evidence
Specifications, grading, and authentication
- Mass
- 3.2 g
- Diameter
- 20 mm
- Hole
- none
- Edge
- reeded
- Production year
- 1948
- Legal issue year
- 1948
Material-specific grading
Brass and bronze: assess color change, verdigris, spotting, cleaning, fingerprints, and strike.
Authentication
Verify weight, diameter, thickness, alloy, magnetism, hole, edge, date and character style, die alignment, and evidence of casting, plating, altered dates, fake patina, or modern reproduction. Do not use destructive testing.
Continue
Related Taisho–Showa references
Evidence
Sources and scope
These links support the claims on this page. Source authority does not imply permission to republish source images.
Official specifications, first-issue years, legal-expiry dates, wartime and postwar regular types.
Open source1914 Silver Yen production context, 1948 brass 1 yen, its 1950 production stop, and the 1955 aluminum successor.
Open sourceImage identity and file-level reuse metadata only; historical claims are verified elsewhere.
Open source