SS marked pretty much everything from toothpaste to bullets. I would imagine that if it were SS material issue, then it would have some sort of markings to indicate it as such, rather than a hand made sticky label.This crude labeling attempt is just a rip off. Peal it off and you'd have a nice gas mask set.
That's what I thought , I've seen SS marked Canteens and other field gear , so why not gas masks .
I don't see why there wouldn't be gas mask canisters individually labeled by SS soldiers out there too. This particular one still reeks of being a contrived label added to up the value though.... it just looks all wrong.