A recently discovered Charles I threepence of the Dovey Furnace mint from a previously unrecorded obverse die and known reverse die. The coin having been over-struck on a flan previously struck as a sixpence also appearing to come from the Dovey Furnace mint.
A Third Obverse Die for Dovey Furnace Threepences – – D. I. Greenhalgh
BNS Research Blog 