1928-67 Irish Halfpenny (reverse design). The actual reverse design used on the first coins of 1928 featured quite a few modifications to the original pattern submitted by Metcalfe. This was done to improve metal flow and other mechanical coin production reasons.

O’Brien Coin Guide: Irish Pre-Decimal Halfpenny

The halfpenny (½d) (Irish: leath phingin) was the second-lowest value coin of the pre-decimal Irish pound. There were 2 to a penny, 24 to a shilling, 48 to a florin and 480 to a pound.  First issued in 1928 it ceased to be legal tender on 1 August 1969, although they were readily accepted by shopkeepers until decimal…