These are collector's items in Japan. I have had the pleasure of holding one, but not using one.
I don't know the current market in Japan, but about 8-years ago my friend wanted about 500,000 yen for the one he had in the shop.
I stupidly walk away from a Canon WWII rangefinder X-ray camera at a flea market because I didn't know what they hell it was, but when I researched on the net, I hurried back to get it but it was already gone.
It pays to research and be educated!