Brass weight, part of a set of apothecary's scales from Houston House, by Uphall, West Lothian

Brass weight, part of a set of apothecary's scales from Houston House, by Uphall, West Lothian

Brass weight, part of a set of apothecary's scales from Houston House, by Uphall, West Lothian

Wedge-shaped perforated weight or macehead of porphyry from Gallowhill, Turriff, Aberdeenshire

Lead weight with a brass top ornamented with interlaced work, from Talnotrie

Small cylindrical lead weight, from Jarlshof, Shetland

Circular lead weight from Jarlshof, Shetland

Bronze weight in the form of a horse, of Norwegian origin, Medieval period, 14th century AD, found at Crosskirk, Esha Ness, Shetland

Cast brass sculpture in form of a gunboat with figures of men at either end and birds in the rigging, in the style of a goldweight used for valuing gold-dust: West Africa, Ghana, Asante, late 19th-early 20th century

Weight of brass cast in form of leopard seizing porcupine, for valuing gold-dust: West Africa, Ghana, Asante, late 19th century

Cast brass gold weight in form of a seated woman and child: West Africa, Ghana, Asante, late 19th century

Cast brass gold weight in form of conjoined birds with interlaced bodies: West Africa, Ghana, Asante, late 19th century

Cast brass goldweight in the form of a chief's asipim chair: West Africa, Ghana, Asante, late 19th-early 20th century

Gold-dust weight of cast brass, pair of sandals in form: West Africa, Ghana, Ashanti

Gold-dust weight of cast brass, square with double comb device in form: West Africa, Ghana, Asante, late 19-early 20th century

Gold-dust weight of brass, cube with cubical projection on each face: West Africa, Ghana, Ashanti