ITT 568/2568 series phones

[Babybearjs]

has anyone come across an ITT 568 or 2568 series phone? I was browsing surplus sales of Nebraska and they were showing a 6 button phone with a 568 model number. all the paperwork I have stops at 567, so I wanted to ask if anyone knew whether or not these phones actually exist or are they custom. the listing mentions Comdial... so I wondering if they are newer phones that have been made in the 1990's...