Both last a long time, but they get worn down and change color, and lose their shine.
Quarters and most other silver US coins contained 10% copper; the last coins made of that alloy were dated 1964. The US has never made solid silver circulating coins. Pure silver is far too soft for use in coins, so it was always alloyed with copper for hardness.
It was 1964 when the last coins in the US were made from 90% silver.
The last year for silver silver dollars was 1935. There were no dollar coins minted again until 1971, by which time silver coinage had been replaced with copper and nickel.
From 1794 to 1935, US silver dollar coins were made of an alloy of 90% silver and 10% copper. The last circulating silver $1 coins were made in 1935, although others have been struck since then either as experimental pieces or as special coins minted for sale to collectors and investors. Popular myth and Internet rumors to the contrary, modern $1 coins have no silver at all. Those minted from 1971 to 1981 and in 1999 are copper-nickel. The new "golden" dollars are actually brass.
US halves were never made of pure silver, all pre-1965 (1964 was the last) coins are 90% silver and 10% copper. From 1965 to 1970 they were made of 40% silver and 60% copper. From 1971 to the present they are 75% copper and 25% nickel bonded to an inner core of pure copper.
no copper-nickel UK coins were last silver in 1946
Quarters and most other silver US coins contained 10% copper; the last coins made of that alloy were dated 1964. The US has never made solid silver circulating coins. Pure silver is far too soft for use in coins, so it was always alloyed with copper for hardness.
Until 1919, the Halfcrown coin was made from 92.5% silver. From 1920 to 1946, the Halfcrown coin was made from 50% silver. From 1947 to their last minting in 1970, the Halfcrown coin was made from a copper and nickel alloy.
The last circulating silver coins in England were struck in the 1946. Since then any silver-colored coins, including your 10p piece, have been made of copper-nickel.
The Royal Mint has not produced a purely copper coin since 1860 when they changed to bronze for making "copper" coins. The bronze consisted of 97% copper, 2.5% zinc and 0.5% tin. All British "copper" coins are now made from copper plated steel. The Royal Mint does not produce any purely nickel coins either, but coins made from an alloy of 75% copper and 25% nickel. Of the two, the copper/nickel coins would last a little longer. The Royal Mint expects to get 40 to 50 years use out of its coins before they recycle them.
It was 1964 when the last coins in the US were made from 90% silver.
The last year for silver silver dollars was 1935. There were no dollar coins minted again until 1971, by which time silver coinage had been replaced with copper and nickel.
"Pure" silver coins were never minted in Britain. The closest to pure silver used in coins is sterling silver which is 92.5% silver usually alloyed with copper. Sterling silver coins were last issued for general circulation in 1919 and 1920, beyond 1919/1920 the coins were debased to 50% silver. The Royal Mint still produces Proof and bullion coins (not for general circulation) which are made from sterling silver, but this is reflected in the price you pay for them.
From 1794 to 1935, US silver dollar coins were made of an alloy of 90% silver and 10% copper. The last circulating silver $1 coins were made in 1935, although others have been struck since then either as experimental pieces or as special coins minted for sale to collectors and investors. Popular myth and Internet rumors to the contrary, modern $1 coins have no silver at all. Those minted from 1971 to 1981 and in 1999 are copper-nickel. The new "golden" dollars are actually brass.
US halves were never made of pure silver, all pre-1965 (1964 was the last) coins are 90% silver and 10% copper. From 1965 to 1970 they were made of 40% silver and 60% copper. From 1971 to the present they are 75% copper and 25% nickel bonded to an inner core of pure copper.
On the death of the last of the Good Emperor's, they suffered economic crisis. Their money went to the military then coins were minted using copper, silver, and lead which the people refused to use.
1964 was the last year for 90% silver coins and 1970 was the last for 40% silver coins. Special Bicentennial (1776-1976) collectors coins were made in 40% silver. From 1992 to date proof collectors coins have been struck in 90% silver.