Coins made between 1920 to 1946 have a 50% copper and silver content, because of the copper content its possible to get a black mark around your finger, we do seal the rings with jewellers seal to prevent this but they may require sealed at a later date, clear nail varnish is a good substitute.
Shillings dated 1937 onwards will not show the date on the finished coin ring as the design was changed.
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