The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
AG Russell Titanium lock-back folder or ultimate pen knife? Edit; Maybe the Titanium folder does not have a hole for a key chain but the pen knife does.
http://www.agrussell.com/knives/by_.../a_g_russell_25_titanium_lockback_folder.html
If you can find one of the old Spyderco Mini Police Titanium necklace knives, those are about as small as you can get with a blade less than 1 inch. The blade is ATS-34, and is a lock-back, plus, it's serrated, and cuts VERY well. They are pretty hard to find, though. I got mine about 5 years ago for $50 on Ebay. They go a bit higher nowadays.
The A. G. Russell pen knives are great.
I've seen a Chive on a keychain before. A little bigger than some, but still quite small.
Daniel
Mini police necklace and the mini police key chain come to mind thats for sure. They are in stock and not that hard to find actually. One goes for $79 the other goes for $99.
take care
aj
That first one looks like a ladybug