We need more info. Please be more specific.
10 cents, the coin has no silver.
US dimes from 1965 to date are copper-nickel not silver. The coin is face value.
Pre-1965 U.S. dimes are made of coin silver (900 fine), not sterling silver. In any case your coin is worth about $1 for its silver content.
10 cents, the coin has no silver.
The 1965 Kennedy half dollar is a 40% silver coin (1965-1969) but so many were made only a very high grade uncirculated example is worth more than the silver in the coin. The silver value today is about $2.70
No quarters have been made in Delaware. No US coin dated 1965 has a mintmark or any silver in them, the coin is face value.
You most likely have a gold and silver plated 1965 (copper-nickel) British crown (5 shillings) these are incredibly common and the gold/silver plating adds no value to the coin. Your coin is worth 50 cents to a dollar or so.
Sorry but there is no such coin. Before 1965 quarters were made of 90% silver and 10% copper. In 1965 to date they were made from about 92% copper and 8% nickel.
The U.S. produced 20-cent coins from 1875-1878.The only U.S. coins dated 1965 that contain silver are half dollars.
Assuming it's an American quarter, it's worth $3 for the silver in February 2018.
There is nothing you can do to make a coin worth more than what it is.
Its the same. 2 kuna is worth.