An English 1199-1216 King John Silver Cross Penny, depending on which of the many variants and its condition, could fetch anything from £45 to £425 GBP. A reputable coin dealer will be able to assist with proper identification and give a more accurate valuation.
No, there is no silver in a 1817 US penny.
US pennies have never been made of silver.
There is no such thing as a U.S. silver penny.
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The 1971 British 1 New Penny was made from bronze and features Queen Elizabeth II on the obverse and a crowned portcullis on the reverse. Unless it is in mint condition, it is worth 1 Penny. If you have a "silver" 1 Penny that matches the description above, you have a 1 New Penny coin valued at 1 Penny. If you have a "silver" 1 Penny that does not match the description above, you very possibly have a sterling silver Maundy 1 Penny coin valued at up to £25 GBP. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.
There was never a silver Indian Head penny.
No such thing as a 94 silver penny.
The Threepence was not introduced into the English currency until about 1550.
Our word 'penny' comes from the Old German word 'pfennig'. First use of 'penny' in English, meaning 'small/little coin' originates early 9th. century. Interestingly, the (strictly) earliest English 'penny', as one-twelveth of a shilling, was first made of silver, then bronze, then only later, copper.
The oldest English penny is the Anglo-Saxon penny, which dates back to around 775 AD during the reign of King Offa of Mercia. These early coins were made of silver and marked the beginning of a standardized currency system in England. The design and minting of pennies evolved over the centuries, but the Offa penny is often recognized as one of the earliest examples of English coinage.
The U.S. has never made one cent (penny's) coins from silver. The coin has likely been silver plated. It is not rare or special, it's just a penny.
U.S. pennies have never contained silver. Your penny is probably silver plated for jewelry or other decorations.