A scarce tin not commonly found to Anti Aircraft Searchlight Detachments.
Original contents label is still present on the underside of the lid and dates 9/39.
It measures the same as a Small out fit tin.  Taken off the lid it measures 23.7 x 15.2 and 5.7 cm in height.
Condition: in good condition commensurate with use and age. 
Weight: 586 g.