It was, and still is, apparently, a practice to enamel or otherwise decorate coins and use them as jewellery.
The States of Jersey One Forty-eighth of a Shilling coin was only minted in 1877, but since your coin is blank on one side, it may have been made especially as a piece of jewellery.
Modified coins have no collector value, but it may have some value as a piece of jewellery.
A reputable coin dealer may be able to advise and give a valuation.
There was no States of Jersey 1930 One Twelfth of a Shilling coin minted.
There were no States of Jersey One Twelfth of a Shilling coin issued from 1895 to 1908 inclusive.
Such a coin does not exist. In 1909, the only coins issued by the States of Jersey were the One Twelfth of a Shilling and the One Twenty-fourth of a Shilling coins.
There were no 1891 coins struck.
A States of Jersey 1911 bronze One Twelfth of a Shilling (KG V), uncirculated and in absolute mint condition could fetch up to £30 GBP. If it has been circulated but still in good condition, it might fetch anything from £5 to £20 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A States of Jersey 1894 bronze One Twenty-fourth of a Shilling (QV), uncirculated and in absolute mint condition could fetch up to £25 GBP. If it has been circulated but still in good condition, it might fetch anything from £3 to £15 GBP. A States of Jersey 1894 bronze One Twenty-fourth of a Shilling (QV)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £200 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A States of Jersey 1858 copper One Twenty-sixth of a Shilling coin (Victoria), uncirculated and in absolute mint condition could fetch up to £90 GBP. If it has been circulated but still in good condition, it might fetch anything from £5 to £55 GBP. A States of Jersey 1858 copper One Twenty-sixth of a Shilling coin (Victoria)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £150 GBP. A reputable coin dealer will be able to give a more accurate valuation.
It is a long story, but what is referred to as a Jersey Halfpenny, is the equivalent British title of the States of Jersey "One Thirteenth of a Shilling" coin, based on the conversion value of the French Sous coin which was previously used on Jersey prior to British possession. A States of Jersey 1870 bronze One Thirteenth of a Shilling coin (Victoria), uncirculated and in absolute mint condition could fetch up to £65 GBP. If it has been circulated but still in good condition, it might fetch anything from £5 to £35 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A States of Jersey 1888 bronze One Twelfth of a Shilling (QV), uncirculated and in absolute mint condition could fetch up to £40 GBP. If it has been circulated but still in good condition, it might fetch anything from £5 to £25 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A States of Jersey 1871 bronze One Thirteenth of a Shilling coin (QV), uncirculated and in absolute mint condition could fetch up to £65 GBP. If it has been circulated but still in good condition, it might fetch anything from £5 to £35 GBP. A States of Jersey 1871 bronze One Thirteenth of a Shilling coin (QV)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £200 GBP. A reputable coin dealer will be able to give a more accurate valuation.
One Twelfth of a Shilling, apart from the obvious answer of One Penny, was a coin issued by the States of Jersey from 1877 to 1964. Other fractional denominations included One Twenty-fourth of a Shilling and One Forty-eighth of a Shilling, possibly recognisable as the equivalent of a British Halfpenny and Farthing respectively. Prior to 1877, it was even more confusing with coins such as One Thirteenth of a Shilling, One Twenty-sixth of a Shilling and One Fifty-second of a Shilling.
The States of Jersey, Island of Jersey, Bailiwick of Jersey One Twelfth of a Shilling coin was issued variously from 1877 to 1966. As the name of the coin suggests, it is One Twelfth of a Shilling, or a Penny. The collector value of any of these coins would depend on the year and the condition.