Type 38 Stock Question

[F-Tang]

So, someone I know recently came across a Type 38 Arisaka, but has a question about it. The thing is a mismatch, and pretty beat up, the bore looks good, but someone decided to Parkerize it after the war sometime, likely attempting to "refinish" it. The Mum has been worn off as well, and the marks from that refinished over with the Parkerization. The main question arises from the stock. It's beat to hell, but that's not the problem, every image of a T38 I've seen has a small groove out of the stock, just underneath the sight usually, like this:


The issue is, this one hasn't got that groove.

As you can see in that cellphone image, it hasn't got the groove where it normally is, in fact, it hasn't got it at all. The stock also has no discernible markings to tell where it's from, no letters, stamps, nothing. The question is; is the lack of the groove some sort of rarity, is it a last-ditch stock mismatched to a Series 24 T38, did someone have this stock made for them when they got back to wherever from Japan, or were there just some stocks not made with the groove in them?

Any help would be appreciated.

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