The first Isle of Man general circulation nickel-brass One Pound coin, also known as a Sovereign, was issued in 1978.
They were probably minted in 1977.
The first gold Fifty Pound coin issued by the Royal Mint was in 1987.
These coins are still potentially 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 One Pound in the Isle of Man. The Isle of Man currency (Manx Pound)(IMP) is pegged at par with the British Pound Sterling (GBP) and the Isle of Man decimal coinage, for the most part, resembles the dimensions, composition and history to the equivalent British coins. Isle of Man currency is "legal tender" only in the Isle of Man, and is not acceptable tender in Britain.
Isle of Man coins are minted by the Pobjoy Mint. The Pobjoy Mint does not give out mintage information.
An Isle of Man 1974 four gold coin set (QE II)(5 Pound to Half-Sovereign, in absolute mint condition and original packaging, could fetch up to £1,300 GBP. A reputable coin dealer will be able to give a more accurate valuation.
An Isle of Man 1979 cupro-nickel One Crown coin (Elizabeth II)(Millennium of Tynwald - Viking longship and Godred Cravan), uncirculated and in absolute mint condition could fetch up to £4 GBP. An Isle of Man 1979 cupro-nickel One Crown coin (Elizabeth II)(Millennium of Tynwald - English ship and Castle Rushen), uncirculated and in absolute mint condition could fetch up to £6 GBP. An Isle of Man 1979 cupro-nickel One Crown coin (Elizabeth II)(Millennium of Tynwald - Lifeboat and Sir William Hillory), uncirculated and in absolute mint condition could fetch up to £6 GBP. A reputable coin dealer will be able to give a more accurate valuation.
There has been a British Five Pound coin on and off since 1817. The British decimal Five Pound gold bullion coin was first issued in 1980 and the Five Pound "Crown" coin was first issued in 1990. The current British Five Pound "Crown" coin is intended to be a non-circulating legal tender commemorative coin. The Royal Mint has no current plans to produce a general circulation Five Pound coin in the foreseeable future.
The pound sterling is a coin minted by the Royal Mint. One bank in Scotland issues a One Pound note.
These coins are still potentially 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 20 Pence in the Isle of Man. The Isle of Man currency (Manx Pound)(IMP) is pegged at par with the British Pound Sterling (GBP) and the Isle of Man decimal coinage, for the most part, resembles the dimensions, composition and history to the equivalent British coins. Isle of Man currency is "legal tender" only in the Isle of Man, and is not acceptable tender in Britain.
If you refer to the British Five Pound (Crown) coin, they do not have a mintmark. They were all minted at the Royal Mint in Wales.
The larger pre-1998 50 Pence coins were withdrawn from circulation and demonetised in 1998. 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 have little or no value. The Isle of Man currency (Manx Pound)(IMP) is pegged at par with the British Pound Sterling (GBP) and the Isle of Man decimal coinage, for the most part, resembles the dimensions, composition and history to the equivalent British coins. Isle of Man currency is "legal tender" only in the Isle of Man, and is not acceptable tender in Britain.
The 1975 Isle of Man 'MANX CAT' CROWN (25p) would be worth around £2 - £3 (September 2010). They often come in plastic cases surrounded by a red cardboard for presentation. The same coin was also struck in sterling silver (0.925) and would be worth around £12 - £15.
The larger pre-1998 50 Pence coins were withdrawn from circulation and demonetised in 1998. 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 have little or no value. The Isle of Man currency (Manx Pound)(IMP) is pegged at par with the British Pound Sterling (GBP) and the Isle of Man decimal coinage, for the most part, resembles the dimensions, composition and history to the equivalent British coins. Isle of Man currency is "legal tender" only in the Isle of Man, and is not acceptable tender in Britain.