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Medal · United Kingdom
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The Colonial Prison Service Medal was established on 28 October 1955 as a long service medal of the United Kingdom and the Commonwealth. On 10 April 2012 the medal became known as the Overseas Territories Prison Service Medal, and underwent a minor change in design. This reflected the change in the way Britain's remaining colonies were described, they having been classed as 'Overseas Territories' from 2002.
From Wikipedia (article), under CC BY-SA 4.0.