The folding stiletto is my all-time favorite style of folding knife. Unfortunately, there aren't many options, and the "traditional" ones that do exist tend not to be of very high quality.
By "traditional" I assume you mean lockbacks with guard bolsters.
Here are a few brands of manual "traditional" style stilettos that I possess, and that are still available -
Benchmark. Comes in a variety of sizes. I have the 10.75 inch. Nice bayonet-style blade, after reprofiling the edge mine was shaving sharp. The knife just feels good in the hand. But unfortunately the overall construction is flimsy with plenty of blade play. Stamped/hollow brass bolsters. Pinned construction.
Kriegar. I've only seen one size, 9". They come in a variety of styles based on when they were made. The really old ones (first generation) have flat-ground blades, solid stainless steel bolsters spot-welded to stainless steel liners, all pinned construction, and they came in a variety of handle colors/materials. I have one, it came with lots of blade play, but I fixed that by replacing the pivot pin with a modern screw pivot assembly. I also added a thumbstud that enabled me to flick the knife open. The blade took a shaving-sharp edge.
The 2nd generation of Kriegar stilettos had bayonet-style blades, hollow/stamped stainless steel bolsters, and stainless steel liners. No spot-welding, only pinned construction. These are more flimsy than the first generation Kriegars. I also replaced the pivot pin on mine. I didn't bother sharpening it. It does have solid lockup though.
The 3rd generation of Kriegars are basically identical to the 2nd gen. except the bayonet blade has a fuller going down both sides of the blade. And I believe they only come with wood handles. Also flimsy construction.
Kissing Crane. These used to be made in a variety of sizes. I have a 9" (which I believe is the largest currently available). These have flat-ground blades, hollow/stamped brass bolsters, brass liners, and come in a variety of handles. All pinned construction. The one I have is old (bought in 1986, with the guard bolsters soldered to the liners), and from what I've heard quality has dropped, but I have no firsthand experience with current models. Mine took a shaving-sharp edge. I carried it for several years in my late teens and early twenties using it for many of my daily knife chores.
Right Edge. These are my favorite. They only come in 10.75 inches. They feature solid stainless steel bolsters spot-welded to stainless steel liners, flat ground blades that take a shaving-sharp edge, and they only come with wood handles. All-pinned construction. Due to the solid bolsters and spot-welding these knives have a robust and solid feel. I've purchased several of these, and I've customized several, making some one-hand open/close, and converted one into an auto (using a different blade). They tend to have blade-play both forward/back and side-to-side, but because they have solid steel bolsters it's possible to re-peen the stainless steel pivot pin and tighten the pivot up. However, with a slightly loose pivot I'm able to wrist-flick one of my stock Right Edges open (experiences may vary). The right Edge is the least expensive ($7.99) of all the knives I've mentioned, which is surprising because I consider it to be the best of the bunch. Like I said, I've owned several of these, with some being better constructed, and with less blade-play out of the box than others.
All that being said, my Cold Steel 6" Tilite is by far, both my favorite stiletto, and my favorite folding knife. I resisted buying a Tilite for many years (I started with the 4") because I was a bit of a strict "stiletto traditionalist" (lockback, guard bolsters) but the Tilite series won me over (as did the various torture-test videos there are showing how much stress and abuse they can take).
Unfortunately my photo posting skills have lapsed, otherwise I would happily show-off my stiletto collection.
Also, just to mention it in case you didn't know, but it is perfectly legal to own stiletto switchblades of any size in California (I'm a 50 year resident). I own a few, and have ordered several switchblades from out of state with no issues.
Good luck in your search. Like you, I truly wish there were more high-quality folding stilettos available.