Huh. That looks more like a Peerless (or the clone of it, made by Pioneer) tweeter. That same tweeter was used in some later KLH and Polk models, in the early 1990s. That flange style (with the three bolts holding the magnet on), the very slight horn-load, and the three-point phase shield, plus the patterned surround (ribbed surround) around the dome are dead giveaways of that model.
Of course, I guess you could say, that since the Tymphany merger, Peerless and Vifa are the same thing anyway... but back then, it should have been a Peerless...
Regards,
Gordon.