Dumble is a hard genre of overdrive to get right, but this is a juicy option: big chewy sustain, clarity across the strings, warm expansive harmonics. Nice!

Model: Vertex Effects Ultraphonix Overdrive
Made: USA, recent model
Serial: UP-2308
Type: overdrive, Dumble voiced
Power: standard 9v DC negative power supply (not included)
Equivalent new street price (approx): $309aud
Mods: none
Accessories: original box and manual

Condition notes: used, no major marks. Tested and fully functional.
Overall: very good condition (8/10)