Here is a great bass collection featuring the ‘Stick Bass’, ‘Fretted Fretless’, Flying V Twin Fretted / Fretless’ and more as owned by Clinton Lee
Twin neck flying V bass. This features a standard fretted and fretless neck.
Here we can see two Stick basses. One is a regular stick fretted to the 12th fret under all 4 strings, the top bass is a Stick fretted fretless.
The above is a regular stick bass as owned by Sting from the Police and Derek Holt from the Climax Blues Band.
Another twin neck bass in the style of a Steinberg. Top neck fretless, bottom fretted.