Wersi Baß Synthesizer, Bass Synth, analog

via this auction
Googlish translation from German:
"It is a monophonic synth in 1977 from the house Wersi.

It is equipped with a 36er keyboard and works with an oscillator that vibrates at a frequency of 2 MHz. Tell a top octave synthesizer is heruntergeteilt while the audio voltage. At waveforms can be selected individually or simultaneously: Sine octaves in the 1 ', 2', 4 ', 8' and 16 ', saw 8' and 16 'square and 8'. A so-called Wah-wah filter can be manually operated, both are controlled by a single LFO as well as automatically with triangular wave. For the volume control, a attack / release envelope is available.

Furthermore, the effects, vibrato, glide, and a switchable bass guitar preset available, and is really good. That is what distinguishes the synth to imitate a bass guitar and he does great."