The NS and SN (panda dials) are like rocking horse shit. Anything good is locked away in a collection, anything on the open market is either way overpriced or a parts watch (or both). For example the NST you just posted has had a polished case and the subdials aren’t particularly clean, it’s in ok / good condition but it wouldn’t make me drop my knickers. There are a lot of 2447 S’s around tho and prices seem to generally reflect this.
I’d quite like an 2447 SN or a Heuer Abercrombie and Fitch but I’m saving next for a nice UG Nina which will scratch the panda dial itch.
Anything this rare (very few were actually made, and the original condition makes it all the more valuable) is unfortunately too risky to wear everyday or even on rotation. I do wear it out, but perhaps only every few months.
If I’m lucky this piece will significantly appreciate. There’s no reason they won’t eventually price around the same mark as early Daytonas which ten years ago were around the same price but now comfortably fetch £70-£100k... I live in hope!