Not sure if that lock nut is a Kahler, but it looks pretty similar to the original Ibanez "Top Loks" (or Top Lok 2) in the 85 Iby catalog. Ugly, eh?
Best I can tell, I think someone put Iby hardware (tuners, lock nut, and plate) on a neck from another manufacturer. Mostly I was just curious -- I had an 80s Kramer with the
banana headstock, but couldn't recall Ibanez having ever done one.