Shilling Elizabeth

What kind of coin is this and what its worth?
This coin is silver and on one side it says:
FID DEF
one shilling
with a shield type thing
the year is1955
on the other side it shows queen elizabeth and says:
Regina
Elizabeth 2
Dei (del?) gratia
You have KM# 904 English coat of arms Shilling or KM# 905 Scottish coat of arms Shilling, under Great Britain. The Scottish coat of arms has a lion in it and the English has 3 leopards in it. The coin is made of copper-nickel and not silver even though it looks like silver. They both have the same value of around .25 cents U.S. even though the mintage of the Scottish coat of arms one(27,950,906) is less than the English one (45,259,908) . The coin is to new to have much of a collector value at this time. You need to wait 10 years or so.
Elizabeth 1st Hammered Shilling found by Neil metal detecting wales . com