Hi Karl,
First of all thanks for the scan.
Ya know, I think the color is gray with yellow camo strip. The reason is because this tiger is an early version. From what I understand all the first issue Tigers have gray base color. The camo are usually improvised on the field.
I've seen two-tone camo with gray basecoat matching yellow, green, or white camo applied but never seen a brown Tiger.
That's my guessing.
WC