1942:
Livingstone & Doughty Ltd
Livingstone & Doughty. Millstone Lane,Leicester. Marking Crayons
Rec. Num. 1 of 2
Source: Aeroplane December 25th 1942
1943:
Livingstone & Doughty Ltd
Livingstone & Doughty Wax Marking Crayons 1943
Rec. Num. 2 of 2
Source: Aeroplane February 26th 1943