UK 1d in collectable grades, up to £15-£20, otherwise forget it!
Modified coins have no collector value. Any value would be associated with the necklace.
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Banks will happily buy gold coins for their face value - since this is nearly always far less than they are actually worth. If you wish to sell your coins for their actual value, take them to a reputable goldsmith.
Take the coin to a dealer or look in a book on coins for the value.
3.5 grams
The current value of a 1950 proof set is $750.
It appears that they only circulated 3,600 in 1975.
The Royal Mint produced no British Crown (Five Shillings) coins from 1938 to 1950 inclusive.
The coins are still found in circulation, so if they are not a uncirculated, only face value.
The US mint never made any 5 dollars coins in 1950 please look at the coin again and post a new question
There was no US silver dollar minted in 1950. If you mean a half dollar, it would be worth at least its value in silver which as of writing is about $7.70 but it would be worth more in better condition. As with all old coins, cleaning harms the value.
No US dollar coins were made in 1950
Please turn the coin over and check the denomination on the back. You'll find it's a half dollar. The U.S. did not mint any $1 coins in 1950.
Several varieties were struck in 1950, with values ranging from a few dollars to hundreds. My suggestion is that it should be evaluated in person by someone who deals with Canadian Coins, so a specific ID can be made.
No, for silver coins as the value of silver changes the value of the coin changes. The same is true for gold coins.
These coins are very common and are worth face value.
The value of gold coins can be determined in two different ways--the melt-down value and the coin value. The melt-down value is the value of the pure gold in the coins, which is determined by the weight. The face value of the coins can be found on a collector's website.