They crop up used from time to time, I had a black one for a year or so and enjoyed it.
there are two versions, the early ones had a more “droopy” headstock which always looked odd to me, the later ones have a straighter one which allows better string travel.
the last ones made had a graphite neck (think there may only actually be one with a natural finish...)
@karlfer is selling a really nice retro-J which I think was the replacement for the groove as it still has the more traditional body shape.