During the First World War, production of the sovereign and half-sovereign was suspended, and although the gold standard was later restored, the coins saw little circulation thereafter. In 1920, the silver standard, maintained at .925 since 1552, was reduced to .500. In 1937, a nickel-brass 3d coin was introduced; the last silver 3d coins were issued seven years later. In 1947, the remaining silver coins were replaced with cupro-nickel, with the exception of Maundy coinage which was then restored to .925. Inflation caused the farthing to cease production in 1956 and be demonetised in 1960. In the run-up to decimalisation, the halfpenny and half-crown were demonetised in 1969.