1968 Irish penny flan error E16i - struck in nickel-brass instead of bronze, with a copy of a letter, dated 3rd April 1975, from Royal Mint confirming it was an error. Very rare, uncirculated.

O’Brien Coin Guide: Irish Pre-Decimal Penny Errors

Introduction: This post is a continuation of the research work done by Derek Young and Prof. G.F. Mitchell – first published in the Irish Numismatics magazine. Sadly, this excellent magazine is no longer available and quite difficult to source. The information in this post relates to ‘minting errors’ on Irish pre-decimal pennies. According to a…

John, silver farthing (REX coinage), Dublin mint, willem moneyer (struck on irregular flan). The Old Currency Exchange, Dublin, Ireland.

Irish Coin Daily: King John’s REX Coinage, Silver Farthing, Dublin mint / Moneyer: Willem

Date: 1208/9-1216 Description: John as King of England & Ireland (REX coinage), silver farthing, Dublin Mint, Moneyer: Willem. Weight: 0.33 g Diameter: 9 mm References: Cf. Withers VI p. 37; –; SCBC 6234 Near VF, toned, weak in parts. Struck on an irregular flan. Very rare Obverse: Crowned facing bust, holding cruciform scepter; rosette to…