A Hohner / Bartell Semi-hollow fretless Bass. These were designed by Paul Barth (former master guitar maker for Rickenbacker, Magnatone, and National). From what I've read it's got a carved Spruce top (even though I think it looks more like Maple). The top appears to be made from a couple different pieces. No buckle rash obviously due to the pad on the back of the guitar. The finish has typical checking in the Nitro, and some scuffs from being played for the past forty-something years, but it all seems minor. Binding on the back of the guitar has a couple tiny dings in it (pictured). Tuners have been changed to modern Gotoh's at some point, bridge cover is also gone.
There is no serial number on this one, (from my research they looked like stickers that could be peeled off) but from examples I've seen of other basses, this one appears to be late 60's early '70s. Action is nice and low, and the bass plays effortlessly. You can really get sounds reminiscent of Rickenbackers to a pretty believable upright bass tone out of these great original pickups!
If you have any questions please feel free to ask. This bass has no case with it, the originals sound like they were chip board and probably not many survived this long. Even if they did they wouldn't be protecting it much!
