The AD-850 and AD-M700 are identical but for the color : the AD-850 was to receive the separate but included ADP-110 five-CD case while the M700 was "naked". Five CDs - what a way to go !
Full Sanyo, of course : DAD-M15.
However, the Fisher version has a Philips d/a chip while the original Sanyo used a Sony d/a...
Hectic as it was, the launch of CD probably allowed for a lot of last minute changes and somewhat confusing decisions. And the laser itself might even be a Sharp or an Hitachi ;-)
More details and nudies at the indispensable vintage-audio-laser.