Weights from the Castlereagh Collection for Boston (USA). Boxed set of 6 cylindrical brass weights for the Troy and Avoirdupois system in a leather bound lockable case.
1 dwt Avoirdupois (pennyweight): 0.002 kg 1 dwt Troy (pennyweight): 0.002 kg 1 oz Avoirdupois: 0.028 kg 1 oz Troy: 0.031 kg 1 lb Troy: 0.374 kg 1 lb Avoirdupois: 0.456 kg