I have the following equipment FS. $75 plus shipping takes it all.
There are three KSU sets All executech comdial

Two seem to be the same model

The first one (different) is smaller and black

A sticker says N0616 11-91

Rev K SW08

SN 4471260

The first larger (beige) one is marked

Serial 69649

It also says 0824, then on the next line, something crossed out and B

Then handwritten 706

The other one says 0816X


SN 962490

I also have two boxes of handsets

Let me know.