Canada never made the MK I sets. I believe only Pye in UK did. Production was started in 1941 but was replaced by the MK II in 1942. It appears to have had a narrow window of service. This would date the manual from mid to late 1942.
The manual was probably a cross over between the two sets. This might have allowed the MK I to be used for training.
The line drawing of the 19 set mounted in a Matilda tank is of a MK I set. WftW Vol. 2 has line drawings of all 3 MKs.
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