That was never a standard issue Klein. Up to 1980, Klein was esclusively custom. Then until about 1989 they still made a lot of customs but were developing the stock bikes.
Those track ends were never standard, and what is the logic of track ends with a RD hanger and shifter cable guides?
I haven't seen any internal routing on Kleins until the mid 1980's, but those do look like Klein's style.
The reverse-facing micro dropouts came in about the mid 1990's but they never looked anything like track ends.
If that's a press-in BB, then it's almost surely a Klein.
Those squarish chainstays don't look very Kleinish though.
The cantilever bosses make me think this was a touring bike, but the track ends make me think I have no idea what's going on.
History of Klein Road Bikes on my Blog