1922 Error ”PENCF” on bottom right stamp 1½d. red-brown of right hand marginal block of four overprinted by Alex Thorn & Co Ltd, plus ”Error PENCF corrected” on bottom right stamp 1½d. red-brown of right hand marginal block of four optd. for the Irish Free State, both fine mint with one stamp at top lightly hinged, varieties and other stamp unmounted. This error and the scarce correction can be found on sheet pos. R.15/12 printed from Plate 12. Heinzgeorg Richter certificate (1990) for the later block.