The Vox Viper, or V289, was one of Vox's late sixties semi-acoustic models sporting built in effects. The example pictured was built in late 1967, and Vox's EME plant, in Recanati, Italy.
It is perhaps not as well known as some models; unfortunately the most famous piece of work involving this instrument is its destruction at the hands of Pete Townsend on the American Smothers Brothers TV show.
The built in effects are rather interesting, and consist of an E-tuner (plays a quiet E note), treble/bass boost, distortion (mild overdrive to full blown 60s fuzz) and repeat percussion. These are the same effects as on other Vox guitars and basses of the period, though some also had a built in palm-operated wah wah pedal too. Similar models to the Viper were the V267 Cheetah: same effects plus a tremolo, and the V268 Vox Ultrasonic the top of the range with wah-wah.
The original Vox literature describes the Viper as follows:
Offers the guitarist a world of exciting new sounds and conventional playing ease. Double cut-away fully arched top, and back with twin f-holes beautifully trimmed enhancing the appearance and tonal resonance of the instrument. Built-in E tuner, distortion booster, treble and bass booster, repeat percussion, two exclusive Vox Ferro-sonic pickups. All new easy-to-fret fast neck with Vox double T-bar and adjustable steel rod. Fully adjustable bridge with six individual bridge rollers, providing individual suspension for each string, adjustable forward or backward for perfect in-tune fretting. One volume, two tone controls, 3-position pickup selector. Sunburst or Cherry.
The controls are as follows:
The headstock has the same curved profile of the earlier British Mark and Phantom models, but unlike these it has a large inlaid logo, rather than the decals typically used in the UK. The Viper headstock has none of the floral motifs of some other guitars in the series. Compare this headstock with that of the Ultrasonic.
$2800