Career
The name given to him refers to his monogram, which is a West followed by a key symbol. Eighty-two works signed with that monogram are extant. Many of these are ornament prints, depicting elements of gothic architecture and decorative objects, and were probably marketed mainly as patterns for other craftsmen to follow.
He also produced prints of ships, the first known.
He influenced several other contemporary Dutch engravers, most notably Master I. A. M. of Zwolle. He probably worked for Duke Charles the Bold of Burgundy, and his ship series may have been "portraits" of the ducal fleet.