I think this is a an Irish Army contract No 4. The Irish Republic bought 50,000 as war reserve stock in 1955. Most were never issued, as far as I know with most being disposed of during the 1980s. Some of the last No 4s ever made. Lot of cosmoline to clean off !
*Please note that permits may be issued on average 5-7 business days from application date if firearms are already on your licence. If it is the first firearm to be acquired, the PTA may be issued after 28 days.