# The Weights and Measures Regulations 1963, Regulation 46


(1) Weights shall have their purported values conspicuously, legibly and durably marked thereon, either in full or by means of one of the following abbreviations only:—
lb
oz
dr
gr
oz.tr
oz.apoth
dwt
kg
kilog
kilogram
gram
g
milligram
mg
C.M.:
provided that—
(a) during a period of 5 years from the date of the coming into operation of these Regulations, metric weights which were first stamped prior to the said date may be marked with one of the following abbreviations:—
grm
dg
cg
(b) apothecaries weights may be marked by means of one of the following symbols:—
iv (4 drachms)
ij (2 drachms)
i (1 drachm)
ij (2 scruples)
fs (1½ scruples)
i (1 scruple)
fs (½ scruples)
(2) If the maker's name is stated on any weight, it shall be in letters not exceeding half the size of the letters or numerals indicating the purported value of that weight.

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Source: https://www.legislation.gov.uk/uksi/1963/1710/regulation/46 (the official version)
Page: https://openlegislation.uk/weights-and-measures-regulations-1963/regulation-46
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.