4 Doubles

Guernsey's doubles denomination was entirely local — the island maintained its own copper coinage independent of British sterling, a practical consequence of the Norman customary law and insular fiscal autonomy that Westminster largely left undisturbed. The 4 doubles sits at the heart of that system, with eight doubles equaling one penny local value. Issues across this date range were struck in Birmingham, almost certainly by commercial contract minters serving the smaller British dependencies that lacked their own mint infrastructure.

The KM#2a variety reflects a documented composition adjustment within the series run.