Studer A80 QC (Quality Control) Dual Capstan - incredible rarity ! 7

I offer for sale a very interesting version of the Studer A80 tape recorder. It is the version QC (Quality Control) Reproducer, but was changed for version with the recording option by a technician from the Studer company many years ago.
The tape recorder was used to record calibration tapes, so that's why is the knob to adjust the slant on the bridge heads.
This is version 1/8 " tapes, but it is very easy to change it to 1/4", just buy the elements of tape track driving from model 1/4 "and replace it.
Tape deck has two tape speed of 4.75 and 9/5 cm / s, and as I wrote a version of the Dual Capstan. It also has a switch tapes from FE to CR. Additionally, the equipment is with full Service Manual and various spare parts visible in the pictures and a lot of unused tapes for the recording and the calibration. Tape recorder had the reverse option, but after a change in the ability to record, was disabled.