The 1940 to 1946 Chevrolet truck interiors were painted a metallic beige color. This paint had a sort of "fisheye" appearance, but unlike modern hammered paint, it had no appreciable texture.
The paint that Jim Carter sells for these trucks turns out to be Hammerite Bronze, an off-the-shelf product available elsewhere cheaper. The color is quite close to the original color, but the color variation and texture is far more pronounced than that of the original paint.
I am ambivalent on whether modern hammered paint gives a more original appearance than regular non-hammered paint. I painted the interior of my 41 pickup with the Hammerite Bronze, but wouldn't do it again because of the difficulty in applying the paint.