I've found over the years that NOS doesn't necessarily mean functional. You have to wonder why or how these parts have remained on the shelves for 40 or 50 or 60 years.
I understand what you're saying. But I only have $10 in it. If it doesn't work correctly, oh well. The seller has a bunch of them, and it's evident that the one I got was laying around for a long time. The box it came in looked original, and weathered like the switch. There was a little corrosion inside, but cleaned up well.
I may go for one if the repop ones if the one I have doesn't work out. Do you have a PN for the one you bought, Otto?