You are wrong Boris. There is an “N” in its original hardwood stock on the EE right now. I’ve had several go through my hands.
I guarantee its a import/distributor modified or a refurb replacement.
The soviets stopped dating all original stocks in late 1955. From 1956 onward there are not date identifiers on original soviet stocks. If there are, you can bet they are in Canada.
Canadian imports are an unreliable source for determining traits of original condition, because so many of the Canadian guns exhiubit obvious signs of having been modified even refinished.