“Vintage Octave CAT Synthesizer model 1853, S/N A1955. Note: this is duo-phonic, pre SRM version. I am the original owner of this fine instrument. I love it but am downsizing and must sell. I recently had it serviced. Three ICs were replaced and it was cleaned and calibrated (see photo of receipts.) It is in good working condition and fully functional. Cosmetically it is overall good. All of the knobs are original except for three. In the photo they are the ones for VCO1 Coarse and Fine tuning and VCA volume. There are a few minor scratches. There is a little rust on the outside ring of the input/output jacks but does not affect operation. Also there was a hole drilled on each side panel (see photos) so, it’s ready for strap locks in case you want to rock out like Edgar Winter.
Note: while I have tested and verified that everything is working with no issues, this is being sold AS IS due to the age.” Link