I have only a couple of Vintage CASE and I prize them, only two Collabs and ditto them. So can't judge which is the best era, but I will say that I have a lot of CASE knives made at the turn of the century and up to the present.I've been really satisfied with 95 +% of them.
Bear in mind I'm not American, don't reside in the country so I've had to buy mine online (apart from gifts) so I think that is testament to reliability and quality in the knives and the company. Sent one back for a spring repair and they fixed it quickly and competently, complained about another and they just sent me a new one, keep the other, really remarkable. Sadly, this situation, indeed all knife buying, is now altered by the huge increase in shipping fees, disputes between the US and EU govts, inflation and imposition of tarrifs and counter import taxes etc. I can no longer sell knives to the US or buy them nor can I receive or send gifts, hopefully this will alter but who knows?
What I do know is that CASE is a firm with a genuine pedigree and it has and does produce very worthy pocket-knives across many eras, decades, century even. The last CASE knife I was able to get was a Denim Blue X-Roads Sodbuster (2025) and it's a really well finished knife that's a joy to use. Significantly, CASE are the American knives I most frequently enjoy carrying and using, I have plenty of GEC, Queen, Buck and others and many of these I like, but mostly I opt for CASE. As far as I'm concerned, CASE manages all eras very well indeed

One other thing, they manage the sharpness era really well too...can't be said of every company......

Thanks, Will