A phone tech on the Sundance forum found a mysterious crossbar pbx in a customer's boiler room. Links to the photos and thread have been posted on some of the other collector's listserves:
http://sundance-communications.com/forum/ubbthreads.php/topics/540604/Look_what_I_found#Post540604
It is mentioned that it could be a Hitachi but while it somewhat resembles the Hitachi Crossbar that I posted pictures of at the link below, it isn't exactly the same so I'm thinking some other Japanese Manufacturer.
http://www.classicrotaryphones.com/forum/index.php?topic=2124.msg34273#msg34273
Terry