Medieval Coin Weight. A round uniface coin-weight of British manufacture for checking the ryal (rose-noble). The weight depicts the king, with sword and shield, standing in a ship with a rose on the hull. The same design is used on the ryal. The coins were struck from 1465, and the weight dates to the late 15th or 16th century. The weight of 6.6g (102 grains) is very low compared with a full-weight ryal of 7.8g (120 grains). 6.6g. Late 15th to 16th century. P & B R Withers, Lions, Ships and Angels. 16.5 mm diameter.