Decimal One Pound

Diameter
1983 – 2016: 22.5mm
2016 to date: 23.43mm
Weight
1983 – 2016: 9.50g
2016 to date: 8.75g
Composition
1983 – 2016: Nickel-Brass
2016 to date: Outer: Nickel-Brass, Inner: Nickel-plated Brass Alloy