TESTON, the name of a coin struck in France by Louis XII, in 1513, and in Scotland in the time of Francis II, and Mary queen of Scotland, so called from the head of the king, which was engraved upon it. The silver it contained was 11 deniers 18 grains, its weight seven deniers 11 1/2 grains, and its value 10 sols. The coinage of it was prohibited by Henry III, in 1575, when the value of it was augmented to 14 sols fix deniers. The teston or tester among us was rated at 12d. in the reign of Henry VIII, and afterwards reduced to 6d.