Hi Stabman,
Offhand, Persians, Kris, Ocelot, Caly3's. Most early Clipits.
As I think of more, I'll add models. All Lockbacks.
It's more difficult (labor intensive), but honestly, most customers would rather have PB washers. Both work well, washers do make the knife a bit thicker.
Some of our new higher line designs have in my opinion, set a nice "standard" in performance, fit & finish on high quality production knives.
(Models like the Caly3, Stretch2, P'kal, Dodo, Street Beat, Persians, Kris, E4 / D4 in G-10, Kopa's, Kiwis).
IMO, well thought out designs, very well made out of very high quality materials. We can't sell a bunch of them, but we can't make a bunch of them.
sal