I recently acquired this Charles I sixpence. It was sold as a coin of the Dovey Furnace mint (i.e. Spink 2910 !!), but as it lacks the Aberystwyth plumes, and given the price I got it at, I assume it is a Tower mint coin. The obverse bust looks similar to Sharp E5/2 for the shillings...the "neat Aberystwyth bust"; the crown mintmark is different to that which I've seen before for the Tower mint coinage - anyone got any ideas ? Thanks for looking !