This is a fantasy drawing of William Adams from a British booklet called 'William Adams: The Pilot Major of Gillingham, the First Englishman who Discovered Japan, (published by Gillingham: Mackays, 1934).' According to the scholarly paper William Adams and Early Enterprise in Japan:

Some in England were embarrassed that no similar monument to Adams existed in his native land and after years of lobbying a memorial clock was erected in Gillingham in honour of a native son who, according to the booklet produced for the dedication ceremony in 1934, a time of Anglo-Japanese alienation, had “discovered” Japan. Like the inscription at the anjin-tsuka, the booklet is a product of fantasy and hyperbole, only much more so. […] The booklet also contains a drawing of Adams, pure invention as no contemporary image of him exists, depicting him standing on a ship's deck, chart in right hand, left hand resting on sword, gazing resolutely towards the unknown horizon.