Of tapering three-stage form cast in relief with raised mouldings and with flared and turned muzzle, the mid-section with a band of scrolling foliage with a horned grotesque mask at the top, all in relief, the first reinforce bearing the coat-of-arms of the Amsterdam Admiralty between mermen supporters, the Amsterdam town mark in an oval on a cartouche below, again all in relief, the base-ring incised '...Koster . Me . Fecit . Amsteldami ... ', naturalistic dolphin lifting handles, cascabel formed as a bunch of grapes and cast in relief with acanthus, and plain trunnions below the center line; on finely constructed modern stepped wooden carriage of naval type. 107 in overall; 5 in. bore.
Condition: In partially marine excavated condition. The surface with light green patination over some wear and losses - some markings illegible, some scattered bruising and abrasion.

Literature:
See R. Roth, The Visser Collection, vol. II, cat. no. C107 [712], pp. 33 and 95-98

Koster (also Coster) was a family of gun and bell-founders working in Amsterdam from the late 16th to the late 17th centuries. See A.N. Kennard, Gunfounding & Gunfounders, pp. 99-100