Winchester, cartouches seem OK to me (but Ive been wrong before), but without seeing the features of the stock verifying that it is a true Winchester I wouldnt want to provide a final opinion.
It is my understanding that the original as-issued cartouches were stamped ONLY on authentic Winchester stocks. Win stocks have certain differences from stocks by other manufacturers. I would need pics of inside near bottom of trigger guard inlet and towards the top to form an opinion of the true origin of the stock..