I've been a guitar player most of my life, although more into mandolin and flute now. As a typical guitar player, I've owned a couple of basses just for fun, never really considered myself a bass player. Nothing worse than a guitar player faking it on bass. A good bass player, a "real" one is golden.
Anyway, the two I remember best are a cheap plywood upright acoustic bass I bought for fun. Might have been a Kay... I lost it to my ex-wife in the divorce. The other was a fretless Jazz bass I built from parts. Solid koa body, nice and flamey from the days when koa wasn't so hard to get. It had a striped ebony fingerboard with flush maple "fret" inlays for cheating the notes. I used LaBella nylon tapewounds to mimic an acoustic bass sound. Beautiful bass with a good sound, if a bit heavy. Sold it a few years ago because it wasn't getting played.