A US quarter is a coin worth twenty-five cents, commonly used in United States currency.
Standard copper-nickel clad US quarter: 24.26 mm diameter, 1.75 mm thickness and 5.67 g mass. Earlier silver quarters do not share this mass. The illustrated relief is representative; the circular rim is the measured span.
A £1 coin is a twelve-sided British coin used as standard currency in the United Kingdom.
Twelve-sided bimetallic UK pound introduced on 28 March 2017: 23.43 mm maximum point-to-point span, 2.80 mm published thickness and 8.75 g mass. The older round pound was 22.5 mm across, 3.15 mm thick and 9.50 g; its legal tender status ended on 15 October 2017. Specimen rim measurements are not official thickness tolerances.