In operation from late 1645 to February 28, 1646 when the beseiged castle surrendered. Issues are identified by an "A" mintmark and have features associated with Bristol-mint dies - the Bristol garrison and mint workers had relocated to Ashby-de-la-Zouch Castle in September 1645. Original production is estimated at under 2,000 coins with about 20-30 surviving. Issues include Halfcrowns, Shillngs, Groats and Threepences.