Close up of original plastic still on unit:
Assorted documents: Original Box, Manual, Flyers, Warrenty card, Article on EH company, etc
Back of unit.
Two mods professionally done back in the 1970s by Jim
Walton, Master Tube/amp tech.
One is an input level, the other is a wet/dry mix. Fully functional and 100% working.
Original insert for EH 16 second delay: