This note arose after finding a die sinker’s error in the legend of a James I, third issue shilling with mintmark rose. A simple method is presented to allow the identification of different dies followed by a die study of the shillings of this scarce mintmark. Eleven different obverse and eleven reverse dies have been found from 22 specimens. This is sufficient to allow a tentative estimate of the likely number of dies that might be found with a more extensive study. Details of further specimens will be gratefully received.