From mid-16th century until the end of the 17th, interference with printing by the British Crown thwarted the development of type founding in England—most type used by 17th century English printers was of Dutch origin. The lack of material inspired Bishop of Oxford Doctor John Fell to purchase punches & matrices from Holland ca. 1670–1672 for use by the Oxford University Press. The so-named Fell types, presumed to be the work of Dutch punchcutter Dirck Voskens, mark a noticeable jump from previous designs, with considerably shorter extenders, higher stroke contrast, narrowing of round letters, and flattened serifs on the baseline and descenders.
From a prop standpoint these are cool for two reasons. One, they look perfect for reproducing all manner of realistic grimoires and Mythos texts. Two, they're tied to a particular time and, to a lesser extent, place. That's a real boon if you're looking for an "air of verisimilitude", as Lovecraft himself would put it.