Ok - i have a question that has been bugging me - what was the original finish used by the soviet union during ww2?

Most of the soviet rifles I see from ww2 display light coloured wood, but this seems to be the result of postwar rework. Some have a darker, almost redish tone, which i believe was the wartime colour.

but at the same time -

this photo was apparently taken in '41 and shows two distinct shades of stock finish....

anybody have any photos of rifles with wartime finish? any primary sources outlining the finish? experience replicating the finish? I'm looking to restore an SVT 40 to wartime colours
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