I agree the rifle wasn't stocked by Winchester. And only their sporter M 52 came with that "sporting" stamping on the floorplate, never the target models. So I think the likely scenario is that it came from Winchester as a standard Winchester sporter with typical sporter style stock with "ebony" forend cap and engraved pistol grip cap and checkered steel buttplate with the "Winchester" logo. THAT sporter was then likely restocked as suggested above in their own specialty gunsmithing shop on a custom basis.
I suggest you go to the site, "RimfireCentral.com", to the "Winchester" forum and pose the question to "Seewin". He is fairly quick to respond unless he is gone traveling, as will several other M-52 Win. aficianados. The Winchester museum in Cody goes to HIM for accurate Winchester 52 historical information. He is the LAST WORD in Winchester 52 information.
bullgun
PS; WARNING; EVERYONE over there is going to want to see MANY pix of this rifle.
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