Interesting to hear this is not a "naval" stock. I was watching a documentary that showed soviet naval infantry, and they had these stocks. Very interesting.
Can you post this photos here?
Closer to to end off war there were not to many SVT's used by army, many of them were already put to storage, and those that were used, were used by the most experienced units.
I always wonder where these "facts" come from.

I have seen a lot of differences between what is claimed and what appears to be. Doubt we'll ever get to see the production record of the Russians and no doubt they are written in a language, never mind an alphabet, few of us could read.
Grizz
Soon one Russian researcher will publish a book related to SVT's, but it will be in Russian
I can't say in my experience I agree with Ratnik's findings. "Naval" stocks are few and far between in the hundred or so SVT's I've picked through. The normal AVT stock, however, is quite common. That's just my findings though.
Silverfox, all I've got is a horrible iPhone camera. If you're still interested in seeing some pictures, let me know and I'll take some.
Grizz, it's documented fact. Specifications were changed it 1944,and a dated document exists. Quantity of "naval" stocks is not very high, because production quantity in 1944 and 1945 is low.
You will not find "naval" stock dated earlier than 1944. All of them will be 1944, 1945 dated or undated (refurbs), with only one exception, see below.
But on my personal experience, in Ukraine they are quite common
I also mention some "naval" stocks produced during short period in Podolsk in 1941. As all other Podolsk stocks, they were marked with oval with arrow from the right side. But quantity was very low
Currently I dont have picture of such stock, but here is patriotic poster printed in 1941
Alex