Jim, all the Cab 11s should be 1940 models. The Cab 12 came in in late 1940 (Nov or Dec). Having said that I suppose there could have been a few that got assembled with 11 Cab parts after that but who knows? On my Cab 11 F15A the serial number is stamped in the vertical part of the frame under the passengers door. Any Cab 11 or 12 Fords I've looked at had the number there. On these trucks the serial number is the same as the engine serial number.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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