Single-sided seal depicting William on horseback to *sinister*, wearing armour and a cap-shaped helmet and carrying a broadsword and a convex shield. The shield apparently has a chevron-like impression upon it, though Stevenson and Wood note that this may be accidental.
Image description (reverse)
Legend (obverse)
SIGILL’ WILL’I FILII IOHANNIS (“Seal of William son of John”).