Chevrolet did get permission from the government to build civilian trucks for "essential users", starting in January of '44. Those trucks are considered an extension of '42 model year, which was cut short due to the war. The available colors for the '44-'45 trucks were Turret Gray, White Cream, Yellow, and Orange.
Judging from the serial number you've posted, you have a 1942 (early) 3/4 ton built at Oakland CA in September of '41.
