I seem to recall somebody reproduced it aftermarket for awhile in the mid 2000's. I don't think it was a big seller at the time. I don't recall where or who was selling it, it may have been Mojotone or someplace like that.
I would be cool if you can find one or the tolex. It may be like finding a 1968 plexi serial numbered 12302.........
Good luck on the search, I personally love the color.
A bit of unsolicited advice but you might be able to use a vinyl printing service to match the original color, provided the machine can accept thicker vinyls. Then print said color on era correct tolex.