Modelled on a Dumble Bluesmaster, this is pretty different and very high quality overdrive. There's some great note separation and touch sensitivity on offer, it's not especially forgiving but if you're nailing it, it adds a tight and satisfying warmth. Works nicely as a clean boost to thicken out your mids too.

Model: Jetter GS167 
Made: USA
Type: low-mid gain Dumble style overdrive
Power: standard 9v supply
Switching: true bypass
Dimensions, excluding knobs/switches/jacks: 110x60x30mm 
Equivalent new street price (approx): $350aud, discontinued
Mods: none
Accessories: no box or manual
Condition notes: used, few minor marks, excellent condition

Controls
Level (top left): output level
Drive (top right): amount of drive added; starts at pretty clean at left and goes to a moderate saturation
Contour (bottom): moves where a spike in the mids sits, can add a lot of brightness dimed