[R_L]

Stock of the discussed rifle is sanded. Originally serial number or any other stamps were stamped over laquier.
In this case - at first original serial number was sanded, than vertical number was stamped, and looks like only after it was laquired. Here is picture of similar 1943 rifle with better pics. I agree with Ryan, that rifle was refinished not in Soviet Union

Here are pictures how originally serial number was stamped - over laquier

http://forums.gunboards.com/showthread.php?361364-SVT-40-original-stock-finish

 

[R_L]

Here are pics of a Type 1 (1940/1941) and Type 2 (late 1941/1942) receiver if it helps. Note the differences in machining around the front leg. Yours is probably a Type 1, but it won't hurt to check.

Small update - you posted type 1 and type 3.