- One-year India issue: The traditional Sovereign was struck at the Bombay branch only in 1918.
- 22-carat gold: Contains approximately 0.2354 troy ounces of pure gold.
- Distinctive ‘I’ mintmark: Identifies the coin as a Bombay, India branch-mint issue.
- First World War history: Produced after wartime conditions led to gold being redirected to India for coinage.
- Branch-mint collector appeal: Represents a short-lived chapter in the global history of the Sovereign.

