Such a coin does not exist.
The British have never issued a "cent" coin.
The 5 New Pence coin was first issued in 1968.
A silver 1829 5 cent coin is worth between £30 and £80
50 cent
The US has never made any silver 1 cent coins.
its worth 1 cent.
About $12.00
It's currently worth about $10.
The British have never produced a Dollar or cent coins. Their currency is the Pound.
2-24-11 A 90% silver half dollar is worth about $10.00
The Lincoln cent 5 to 10 cents, the Jefferson about $1.00 for the silver.
The U.S. never has struck a silver cent. The coin has likely been plated, and is worth just a penny.
If it's dated 1985, that would be zinc, not silver. It's worth one cent. No US pennies contain silver.
A U.S. 1955 half dollar is worth about $15.00.