10 Shillings

These notes bear Special Identification Markings ("war codes"), consisting of a coloured letter inside a circle as part of the underprint in the upper left and bottom right of the obverse. These were used during World War II to keep track of notes during transport from the printers in the United Kingdom in case of losses due to bombing.
Four letters appear on these notes, L (orange), M (grey), R (black) and E (purple).

For similar notes see P#1A, P#1B, P#1C, P#56 and P#63.
Currency Commission Irish Free State: P#1A
Currency Commission Ireland without war code letters: P#1B
Currency Commission Ireland with war code letters: P#1C
Central Bank of Ireland with promise to pay in London, without war code letters: P#56
Central Bank of Ireland without promise to pay in London: P#63

A list of all the dates of issue of Central Bank of Ireland War Code 10 Shilling Notes, with an image of a note of each date can be viewed on www.irishpapermoney.com.
More information on the design of the Irish 10 shilling note can be found on www.irishpapermoney.com.

The Irish Legal Tender ‘Lady Lavery’ banknotes, also referred to as Series A notes, circulated in the Irish Free State and Republic of Ireland from 1928 to 1977. 

There were seven signature varieties for most denominations of the series.
The 10 Shilling denomination was discontinued in 1968 ahead of decimalisation in 1971, and had only four signature varieties.