YKK zips is always something I look out for when going through op shops (charity shops, thrift shops, whatever you call them). If they spent a few extra cents on a zipper the chances are better it's decent quality clothing.
Are you by any chance Jensen Huang?
You're might be correct on this front if the jacket is fron the mid-to-late 20th century - but as noted in the video today Talon is no more (it still technically exists but as a brand of an HK company). It's pretty much the same story: while YKK is definitely improving, a siginificant factor too is how (usually American) leading companies are cheapening their products because the brands are established (which won't affect in the short term but definitely adds up over the decades).
> For an apparel maker designing a garment that will cost $40-$65 to manufacture, and will retail for three times that much or more, it’s simply not worth it to skimp [on zipper price]
> Multiple apparel designers I talked to recalled incidents in which batches of non-YKK zippers failed to meet their standards
https://slate.com/business/2012/04/ykk-zippers-why-so-many-d...
This is a fairly decent way to find products of good quality. It's far from foolproof, and is certainly ripe for gaming, but it hasn't steered me wrong yet.
I've bought so many high end packs, only to have the zippers fail and have had to re-sew them or hemm the seams back together. I had one mid range pack with YKK zippers about 15 years ago and its been nails on every trip I've been on. After that experience, I just look for YKK zippers now on anything I buy.