Got around to fully cleaning it up, and did throw it on eBay to see what happens.
A little came up from the Jameco lead, but not much besides old advertisements. I emailed Monterey asking for any help with information they could give, but never did hear back (expected). The only other thing I've noticed is an FCC grant filing from "Dyna Micro Inc" for...well it's not clear WHAT, but in the comments it stated this model of keyboard (K2AX) plus other items needed to be included with it. I really couldn't find any mention or information about that company, except old business registration filings. I'm guessing they were shut down not too far after.
I guess this is just plain undocumented, and either had low production, no real production, or was produced for a specific task before it was licensed to Jameco to get a little more mileage from the design.