Force - I'm no expert but know a decent bit about Kleins. The fender and rack mounts makes your model a Performance, Klein's touring frame. The center/top mount downtube shifters (as opposed to the more common side mounted shifters on the downtube) and steel fork means it's pre-90's, probably mid-80's. Kleins, far as I know, did not get any sort of head badge or decal until 1997. The funky white and red steering head decal is not original. The press in bottom bracket cartridge bearing was a Klein mainstay until Trek acquired them in 1995, though weren't phased out for another year or so.
FYI, those bearings can still be easily found, bearing code is 6003-RSR or 6003-2RS, the latter of which is more common. The suffix, those last 3 digits (2RS) aren't as important, it's been my findings that they have to do with how the bearing is sealed. The 6003 is the important part as that dictates the physical dimensions. The bottom bracket spindle is effectively a long, straight, pressed in metal shaft. A basic hydraulic press can get it out.