Need to know if it's US or a foreign coin, post new question.
Value of 1986 fifty cent piece
The 1966 Australian 50 cent coin has a diameter of 31.5mm. The area of one side of the coin is 779.3 square mm.
today if a 50 cent coin contained the amount of silver and bronze it did in 1966 it would be worth $2.67
All 1966 Australian 50 cent coins were minted in Canberra. They have the distinction of possibly being the most hoarded coin in Australia.
The 1966 South African 50 cents coin is between $3.00 and $6.00.
I won't seal 1966 coins 50c praise
Presumably, you refer to the Australian 50 cent coin. The round Australian 50 cent coin was only ever minted for 1966. All subsequent Australian 50 cent coins are dodecagonal or 12 sided.
R20 000
The first and only round Australian 50 cent coin was minted in 1966 and was withdrawn shortly afterwards due to the steep rise in the price of silver. The 1966 round 50 cent coin had an 80% silver content. The next Australian 50 cent coin to be issued was in 1969. It was dodecagonal (12 sided) and made from a copper-nickel alloy.
The first Australian 50 cent coin was issued on the 14th of February, 1966, along with the rest of the initial release of Australian decimal coins and banknotes. The original 1966 50 cent coin was round and had an 80% silver content. Due to steep increases in the proce of silver, somebody figured out that the silver was worth more than 50 cents, so the coin was discontinued. All subsequent 50 cent coins were 12 sided and had no silver in them at all.
Congratulations if you have one, but Australia was discovered in 1770 and the 50 cent coin was not introduced until 1966. You possibly refer to the 1970 Australian 50 cent coin which commemorates the bicentenary of the discovery of Australia by Captain Cook in 1770. These coins are potentially still in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth 50 cents.
Other than the 1966 coin, the only round 50 cent coin ever issued, the Australian 50 cent coin is a cupro/nickel dodecagonal (12 sided) coin of silvery appearance and is often used as a commemorative.See the link below.