Fine Bass Gambas for Sale – Italian Bass Gambas – 1975 Hans & Nancy Benning Bass Gamba for sale
Double bass - Wikipedia
6 string Double Bass; does it exist? | TalkBass.com
EU Electric Upright Bass 6 Amber Stain
Upright Basses — Jordan Violins
NS Electric Upright Bass | EUB Brilliance by Ned Steinberger | NS Design
Upright Basses — Jordan Violins
6-string bass viol I just finished making. IG: @manueldeswaaf : r/Luthier
Pöllmann 4-String Double Bass,1957 – Finostri
Basses for Sale - Double Bass Workshop
6 string bass hi-res stock photography and images - Alamy
Bruce Sexauer's "The String Bass (.com)" offers a wonderful example of American Enginuity, Dalton Dillingham's 6 string "American Standard" double bass.