# The Weights and Measures Regulations 1963, Regulation 40


Avoirdupois weights of the flat-circular type shall—
(a) if made of iron, only be made in purported values from 4 pounds to 4 ounces inclusive;
(b) if not made of iron, only be made in purported values from 4 pounds to half a dram inclusive, and the weights in each set shall be of similar shape and proportional dimensions.

---
Source: https://www.legislation.gov.uk/uksi/1963/1710/regulation/40 (the official version)
Page: https://openlegislation.uk/weights-and-measures-regulations-1963/regulation-40
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.