you are probably quite right but production of the 11 cabs did not start till April 1940 according to Greg's Blueprint for Victory book. As for cab 12's they probably did not start production until 1941 but when is the question. One sure thing is though that the pictured vehicle is not 1939 but late production 1940 or early 1941 as it has the air vents in the front panels either side of the grill.
Another way maybe to find out is when did production of 8cwt 4X2's stop? The 8cwt were fazed out in favour of the 15cwt and this date may give a bearing as to age.
I also looked at the Humber photos and if that is photos of an almost fully restored vehicle my wheelchair is Ford V8 powered.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"
