We discussed this one over at MLP forum. Looks legit only not the story behind it for I have logged numerous Reborn Old with later serial number than this one. Also there's another one discussed in old thread here but the pics are gone now. There's also a Bison Golden Era Reissue owned by Harold that has Fujigen trademarks (and a normal headstock shape).
Curious about the real story behind it.
There may not be any real story behind it, other than it was a prototype for an export model.
There's no reason to lose the open book headstock inside Japan.
Doesn't seem like much of a "missing link" to me, but yes, extremely rare so a good one for the collectors.
One of my favourite colours so I'd buy it if the price was reasonable.