A rare Gem indeed. Must have cost a pretty penny. Only one other person on this forum as far as I know has one. He did a couple of videos. There may have been others before my time.
It never comes up for sale in UK. Whatever you paid, plus all fees cleared and a tiny headroom is what its worth. Its valuable to those that know about it. Based on what ive seen on Japanese sites (not many) best not worrying about value now. It may be worth a lot more in a short few years.
Great to see. Im sure someone will be along shortly. Welcome!