I've had several legit Savage No.4Mk.1* T rifles but have never seen one dated 1943. I've seen Savage Mk.1 rifles dated 1941 and still have 0C160 here in my collection. It was also never completed with a scope. All of the Mk.1* Savages I've had were dated 1942. Many Savage rifles failed the stocking up at H&H and that's why you find them with Britishwalnut forends. They will often have five groove British barrels installed too.
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I think you're mistaking stained birch for walnut smle addict. I've had hundreds of Savage No.4 service rifles and have yet to see a Savage marked walnut forend, handguard or butt. I could be wrong but I don't think they exist. Was your wood replaced with British walnut?