Source: Monasticon Anglicanum, Or The History Of The Ancient Abbies, And Other Monasteries, Etc., published in 1693
This is an example of a wire watermark. This watermark, of which there are two examples shown above and below, consists of a wreath-like image with a "V"-like shape or letter in the center.
Additional Book Information
Monasticon Anglicanum, Or The History Of the Ancient Abbies, and other Monasteries, Hospitals, Cathedral and Collegiate Churches, in England and Wales. With divers French, Irish, and Scotch Monasteries Formerly relating to England. Collected and Published in Latin, by Sir William Dugdale, Knt. late Garter King of Arms. In Three Volums. And now Epitomized in English, Page by Page. With Sculptures of the several Religious Habits. Licensed, May the 25th, 1692 R. Midgley. (Published at) London: Printed for Sam. Keble at the Turks-Head, in Fleet-street; Hen. Rhodes at the Star the Corner of Bride lane in Fleet-street. 1693