Crowns
Victoria(2nd & 3rd portraits) (1887-1900) -- 92.5-percent silver
Edward VII (1902) -- 92.5-percent silver
George V (1927-1936) -- 50-percent silver
George VI (1937) -- 50-percent silver
Half Crowns
Victoria (1837-1901) -- 92.5-percent silver
Edward VII (1902-1910) -- 92.5-percent silver
George V (1911-1919) -- 92.5-percent silver
George V (1920-1936) -- 50-percent silver
George VI (1937-1946) -- 50-percent silver
Florins (2 Shillings)
Victoria (1849-1901) -- 92.5-percent silver
Edward VII (1902-1910) -- 92.5-percent silver
George V (1911-1919) -- 92.5-percent silver
George V (1920-1936) -- 50-percent silver
George VI (1937-1946) -- 50-percent silver
Shillings
Victoria (1838-1901) -- 92.5-percent silver
Edward VII (1902-1910) -- 92.5-percent silver
George V (1911-1919) -- 92.5-percent silver
George V (1920-1936) -- 50-percent silver
George VI (1937-1946) -- 50-percent silver
Six Pences
Victoria (1837-1901) -- 92.5-percent silver
Edward VII (1902-1910) -- 92.5-percent silver
George V (1911-1919) -- 92.5-percent silver
George V (1920-1936) -- 50-percent silver
George VI (1937-1946) -- 50-percent silver
Three Pences
Victoria (1838-1901) -- 92.5-percent silver
Edward VII (1902-1910) -- 92.5-percent silver
George V (1911-1919) -- 92.5-percent silver
George V (1920-1936) -- 50-percent silver
George VI (1937-1945) -- 50-percent silver
From 1920 to 1946, British silver coins contained 50% silver. These coins contain the following amounts of actual silver weight:
Threepence (.0227 Troy ounces of actual silver weight)
Sixpence (.0455 Troy ounces)
Shilling (.0909 Troy ounces)
Florin (1920-1936) and Two Shillings (1937-1946) (.1818 Troy ounces)
Half Crown (.2273 Troy ounces)
http://www.metric-conversions.org/w...to-grams.htm