Charles I (1625-49) silver Half Groat. Triangle mm (struck 1639-40). 

CAROLVS.D:G:M:R:F:ET:H:REX., crowned bust left, II behind, in inner circle 
IVSTITIA.THRONVM.FIRMAT., oval shield in inner circle.

Seaby 2818

Courtesy Ira & Larry Goldberg Auctioneers, Beverly Hills, CA. www.goldbergcoins.com
Sale 31: The Pre-Long Beach Auction May 30 - June 1, 2005, Lot 2159.