The Royal Mint issued no 1977 commemorative gold coins.
Sucha coin does not exist.
The British One Pound coin was first introduced in 1983.
Probably face value, but it's impossible to say for certain without knowing the specific coin.
1983
The cast of A State Visit to Turkey by Queen Elizabeth II - 1971 includes: Princess Anne as herself Queen Elizabeth II as herself Prince Philip as himself
Since 1971, there are 100 pence to the British pound. Prior to 1971, there were 240 pence to the pound.
No queen did not start til 1970-1971
Since 1971, there are 100 pence to the British pound. Prior to 1971, there were 240 pence to the pound.
You do not specify whose Silver Jubilee or the country the coin comes from. Presumably you refer to the Silver Jubilee of Queen Elizabeth in 1977. Many Commonwealth countries minted coins commemorating this event. If you got the coin in your change, it is probably only worth whatever is inscribed on it.
Elizabeth R - 1971 is rated/received certificates of: Australia:PG
Elizabeth McGrath was born in 1971.
Elizabeth Wiskemann died in 1971.
Elizabeth Brinton was born in 1971.
Malawian pound ended in 1971.
The Pound Era was created in 1971.
Gambian pound ended in 1971.