Collectible coins is an export industry in the Isle of Man. Coins of many denominations are struck each year of various metals including gold and platinum that feature the Manx Cat.
Please be a little more specific about which coin you refer to.
There are 4 Isle of Man 1976 Commemorative Crown coins. Two are silver, two are copper-nickel. The silver coins coins are 0.9250 silver, as close as you are likely to get to pure silver.
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.
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The Isle of Man produces commemorative and collector coins as an export industry and often produces many variants of the same coin in different metals. An Isle of Man 1977 cupro-nickel One Crown coin (Elizabeth II)(Silver Jubilee), uncirculated and in absolute mint condition and the original packaging, could fetch up to £7 GBP. An Isle of Man 1977 sterling silver One Crown coin (Elizabeth II)(Silver Jubilee), uncirculated and in absolute mint condition and the original packaging, could fetch up to £10 GBP. An Isle of Man 1977 sterling silver One Crown coin (Elizabeth II)(Silver Jubilee)(Proof), uncirculated and in absolute mint condition and the original packaging, could fetch up to £12 GBP. The values quoted are the best possible for the best specimens in their grades, but may be significantly lower due to varying demand for the coin and the prevailing economic climate. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin. 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.
Please provide a date and check your coin, especially the 25 oz part.
Isle Thing was created on 1989-08-22.
Isle of Flowers was created on 1989-01-17.
its worth 5 isle of man 1973 gold sovereigns, £277 each on ebay Mar 2012 = £1,385
The Isle of Man pound is the same value as the British Pound.The coins are the same, but the banknotes are different. You can use British banknotes in the Isle of Man. Isle of Man banknotes are not usually accepted in mainland Britain, because they are rarely seen, but the can be exchanged in banks.
Mint error coins can fetch a premium over the normal coins. It is unlikely that you coin is worth more than £5 - £10 despite the mint error. Listing the coin on the eBay auction site with a good description and photograph should help the coin find its true value.
Round the Twist - 1989 Isle of Dreams 4-13 is rated/received certificates of: Australia:G
The three legs on the reverse of many Isle of Man coins is the national symbol of the Isle of Man and is referred to as a "Triskelion".