Studio Electronics Selector for ATC-1

If you own a Studio Electronics ATC-1 Tone Chameleon, this is for you.
This rare 1U rack unit made by SE accomodates up to four filter cartridges making it possible to have them always connected to the ATC-1. The module connects to the cartridge slot at the rear of the ATC-1, so you just plug it in and play!
Please note no cartridges nor the ATC-1 are included in this sale. You buy the expansion module alone.
I will ship professionally packed and with trackable insured courier.