A special anniversary 50p celebrates the science behind the world’s first seven-sided coin

Introduced two years prior to decimalisation, the shape of the 50p heralded the revolution to come. Hugh Conway and his team drew upon their knowledge of precision engineering techniques to create the world’s first seven-sided coin. Even though it wasn’t circular, it still rolled smoothly thanks to its shape of constant width. As we continue our 50 years of the 50p celebrations, a special anniversary coin pays tribute to the science behind this radical design.


50 Years of the 50p 2019 UK 50p Silver Proof Coin

Specification Value
Denomination 50p
Maximum Coin Mintage 3510
Alloy .925 Sterling Silver
Weight 8.00 g
Diameter 27.30mm
Specification Value
Reverse Designer Christopher Ironside
Obverse Designer Jody Clark
Quality Proof
Year 2019
Pure Metal Type Silver
Shape 7 Lobed
Country Of Origin United Kingdom
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