Representative issue study
Showa 21 (1946) Large 50 Sen Brass
A surrender-period brass bridge made under an official composition range.
昭和二十一年大型五十銭黄銅貨
- Date
- 昭和二十一年 (1946)
- Denomination
- 50 Sen
- Material
- brass
- Issue class
- postwar-transitional
Context
Historical and monetary setting
Japan Mint history links postwar brass to mixed military scrap.
Identification
How to classify the object
Inspect color change, verdigris, spotting, cleaning, fingerprints, strike, mass, and diameter.
Evidence boundary
What this page does not claim
The alloy range is official; do not invent a single exact percentage.
Issue evidence
Specifications, grading, and authentication
- Mass
- 4.5 g
- Diameter
- 23.5 mm
- Hole
- none
- Edge
- plain
- Production year
- 1946
- Legal issue year
- 1946
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 sourceInstitutional history, Temporary Currency Act, strategic-metal substitutions, ceramic production, surrender, occupation supervision, and postwar scrap reuse.
Open sourceImage identity and file-level reuse metadata only; historical claims are verified elsewhere.
Open source