Crowned trefoil, flanked by initials: P (left) I (right)

Watermark Crowned trefoil, flanked by initials: P (left) I (right)
Date second half 16th cent.
Location of use Cambridge (?), England
Dimensions  16mm x 17mm
Chain-lines gutter 28-28-27-27-27-28-27-16-[13 foredge
Position sideways between 3 and 4
Process Canon EOS, backlighting; Photoshop
Source Farmleigh MS IV E 6, pp 414[h]
Repository Farmleigh House, Dublin (collection under ownership of Marsh’s Library)