A large Charles II silver tankard, John Ruslen, London, 1676

on a speading moulded foot, the lower part of the body chased with acanthus, the plain body engraved with a contemporary racehorse, scroll handle, the cover decorated with a similar leaf, cherub thumbpiece

Michael Clayton, The Collector's Dictionary of the Silver and Gold of Great Britain and North America, London, 197, p. 217

Nice hallmarks on body, cover and handle, engraving probably contemporary, in overall good, honest condition.
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The presence of the contemporary engraving suggests that this tankard was used as a race prize. It is not uncommon that objects other than cups were given as prizes. Although race prizes in the form of bells survive from the late 16th century, it was King Charles II who popuarlised horse racing, whereupon the sport became known as the 'The Sport of Kings'. Silver and gold plate was not only awarded as a a prize, but also used to hold the winnings.