Escon Microcomputer/Selectric Interface System

[Marvin Johnston]

I've got an Escon Microcomputer/Selectric Interface System that looks
like it was sold as a kit. It appears to be a unit to convert a
Selectric I or II typewriter so it can be used as a computer printer. Is
anyone familiar with this unit, and any ideas about what it is worth? It
belongs to the widow of my friend who died last month, and I am trying
to help separate the good stuff from everything else.