It was actually made by Tula (arrow inside a star) and is a rebuild. Ishvek SKS's (arrow inside a triangle) are among the rarest of all the Russians as they were only made from late 1953 through 1954. The serial number of the rifle that the stock was originally on was over stamped when the stock was put on a different rifle during the rebuild process. Your rifle is typical of the thousands of RussianSKS's that were brought into this country before they were manned from import.
Yours is a little nicer than most as it is still blued rather than the BBQ paint that was applied on many of them when they were refurbished. Russian SKS's are commonly viewed as the best of the breed and you have a nice one. Around here, they typically go for $400-500 with nice ones like yours being at the top of the price range.