[David_Hayward (RIP)]

No David, these were # 11 Cabs, with production starting late August 1940 as 1941 Models, August 26th for Fords in fact and September 3rd for Chevrolets. These did not arrive in Alexandria until late December/early January 1941 for assembly, so that's the earliest the photo could have been taken. They were then of course sent to Greece, and then promptly captured, along with 4x2 types, by the Axis!

I can't give you a definite date for the change-over to # 12 Cabs but it was in early 1941 as it included 1940 MODEL Canadian orders, all UK ones being 1941 Models. As regards Chevrolet:

THUMB SCREW TYPE ENGINE HOODS...BEFORE SERIAL # 084XX04001 AND # 184XX05004 (# 11 CABS)
ALLIGATOR TYPE HOOD..ON OR AFTER 084XX04001 AND 184XX05004 TO SERIAL # 284XX01523....(# 12 CABS)