Although there were a few 1947 "First" series I think it is definitley a 41-46 year model. I'm sure someone will come along that can definitely say for sure. Judging from the inside of the drivers door I think it may be a '41....just my opinion. This style truck is known as Art Deco style. '47 was the Advance Design better known as the AD style.
Hang tight. Someone will be along shortly for sure.