Representative issue study
Taisho 9 (1920) Small Holed 5 Sen
The reduced holed type demonstrates that hole size, diameter, and mass define the generation.
大正九年小型五銭白銅貨
- Date
- 大正九年 (1920)
- Denomination
- 5 Sen
- Material
- cupronickel
- Issue class
- regular-circulation
Context
Historical and monetary setting
It replaced the larger 1917 holed cupronickel design and continued into early Showa.
Identification
How to classify the object
Measure coin and central hole; compare character placement and surface before attribution.
Evidence boundary
What this page does not claim
Do not merge it with the larger 1917 type.
Issue evidence
Specifications, grading, and authentication
- Mass
- 2.62 g
- Diameter
- 19.09 mm
- Hole
- 3.9 mm
- Edge
- plain
- Production year
- 1920
- Legal issue year
- 1920
Material-specific grading
Nickel alloys: assess strike weakness, marks, dull luster, corrosion, and cleaning.
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 sourceTaishō holed 5- and 10-sen designs, material saving, anti-counterfeiting, and the unissued Yatagarasu 10 sen.
Open sourceImage identity and file-level reuse metadata only; historical claims are verified elsewhere.
Open source