All Eire (Irish) 50 Pence coins were made from a copper-nickel alloy.
The Irish (Eire) 5 Pence coin was made from a copper nickel alloy.
All Eire 10 Pence coins were made from a copper-nickel alloy.
Silver
Such a coin does not exist. The Eire (Irish) 10 Pence coin was first introduced into the currency in 1969.
The Eire (Irish) 20 Pence coin minted from 1986 to 2000, is made from a nickel/bronze alloy and are not plated. Any discolouration (browning or yellowing) will most likely be due to light tarnishing of the coin.
All years of issue of the Eire 20 Pence coin are identical. See the link below.
It is a Woodcock.
Zero. No Eire (Irish) 10 Pence coin has ever contained any silver, they are made from a copper-nickel alloy.
Please check that date again. Ireland (Eire in Gaelic) did not use decimal denomination coins until 1970, and in any case, the country was under British rule in 1861 so a coin from that date would not have its inscriptions in Gaelic. Look at the coin again"Eire" is read while it is at the top of the coin. If you rotate the coin so that the numbers are at the top you will see that the date is actually "1981". The Irish (or Eire) 50 Pence coin was not introduced into the currency until 1970.
Eire is the Irish name for Ireland. 5p refers to a 5 Pence coin.
The Eire (Irish) 10 Pence coin was first issued in 1969 and last issued in 2000. It was made from an alloy of 75% copper and 25% nickel.
Such a coin does not exist. Decimal currency was not introduced until 1971, including the 2 Pence coin.
The coin is called a "50 Pence" coin. The term "50 New Pence" was last used in 1981.
There was no 1978 British 25 Pence coin minted.
The Irish 5 Pence coin had a bull on the reverse and a harp on the obverse. The bull is from an old Irish legend and the harp has long been the national symbol of Ireland. See the link below for a picture.