4, 5-string · Bolt-on
X-Vector's vintage-style 'OS' Jazz bass - two single-coil J pickups, offset J body, bolt-on neck - in 4- and 5-string. Gallery builds include Ash Sunburst, Blue Ash, Pearl White, a Relic (aged) finish and the OSJ 5 Ash. Hand-built in Sao Paulo, Brazil by Fernando Giovannetti (X-Vector), praised by Brazilian pros for boutique-grade fit and finish. The company's site is photo-based with no published spec sheets or prices, so configuration below is drawn from model naming and gallery builds; full specs and pricing are by quote.
| Construction | Bolt-on |
| Strings | 4, 5 |
| Body | Ash |
| Neck Pickup | Vintage Jazz single-coil |
| Bridge Pickup | Vintage Jazz single-coil |
| Made In | Brazil |