Long before tactical there were older production folders, I'd have to say that at least 70 % of my collection is from the 50's and before.
Estae auctions, flea markets and yard sales, my palms still get sweaty when I find an old near mint example of any older production knife.
I traded an old Leatherman for an old Colonial Fishknife that belonged to a 60 year old guys father,(he remembers it from when he was a kid), it was rarely used and had the original Colonial box it came with.
I'll try to post a pic later.
All those old production pieces, and all those old pattern variations, sometimes it was just a blade shape or a handle material, but you could collect them forever.
And like I said there are fewer and fewer mint examples of these knives, 10 years from now you'll be reading how B. Levine hasn't seen such a fine example since the 90's.