1883 W. T. Brannt tr. B. Kerl 70 Bullion or button balance, inclosed in a case, for weighing gold and silver beads and alloys of precious metals.
1900 (ed. 6) 576 Button Balance.
1981 29 72/2 In the case at the left is a very sensitive ‘button’ balance for weighing gold and silver ‘buttons’.