First of all, it looks like I came to the right place!
Based on what she told me, I have to assume this was some type of test or pre-production unit. Apparently he was heavily involved with this for Atari. I used to have his old Atari business card, but misplaced it over the years.
It does have smooth keys that are not textured.
For the record, I am more of a console collector and not incredibly good with electronics or computers. I would really have no ability to dump BASIC ROM and the OS and would be concerned even opening the unit in case of accidental damage. If there is a reputable forum member here, I would be willing to ship to them if they wanted to do this as long as they promise to send it back. Preferably someone in the US. I am located in Massachusetts. I am all for preservation of classic gaming / computing and more than happy to help.