I'd never seen a real Italian switchblade until the 90's. Always thought my Rizzuto Estilletos were that, they weren't, they're Japanese. Those are built about as well, maybe a bit better than the recent smoke shop ones you mention. The real Italian ones are beefy and feel like quality when you pick them up. You are likely to find 3 main brands, AB (Armando Beltrame), AKC, and Frank Beltrame. They may even make them for each other under. They all come out of the same place in Italy, Maniago. I think the West Side Story on was a 9" but there are lengths on both sides of that too not to mention blade styles like bayonet, dagger, spear, & clip. The 3 above seem to be about the same in terms of quality (very high) and differ in minor details only. They all share the same issues too, how the blade is fitted is the biggie.
You want one where the blade locks straight in relation to the handle, held straight up, blade tip at 12 o'clock. Sometimes they lock a little to the left (fix by filing tang slightly) or to the right (fixed w/ $$$). The blade is also supposed to fit deep into the liners and the tip should not peek out. That can be fixed too but requires a switchblade mechanic to take it apart. They also need to lock tightly open and closed.
Call the vendors up that have them and ask what your recourse is if you get one with issues or if they will check before shipping. Or, consider buying one used where all those conditions are called out and shown not to be present. Like anything, there are good ones and bad ones. Some bad ones can be fixed simply and others likely should not have shipped out of Italy to begin with.
Caveat Emptor!
That said, I think the classic West Side Story switchblades are some of the coolest knives out there. The variety of handle materials, lengths, blade styles, and so on means you could collect 100 and never have a repeat -

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