I doubt it's a LF lens. More likely a P6 lens. Are the blades really missing? Or is the thing just broken? I have a 150 that the linkage is broken. At least I think it's the linkage. Short of taking it apart that's my best guess. The blades are still inside but they don't show up.

What's it worth? You need to find a Pentax user that is willing to pay for the Zeiss name. It used to be a lot easier when used MF equipment was expensive to find people paying high prices for stuff like this. But today you can likely get a real Pentax lens from Keh for not that much money.