Here's a Fender JMJ Mustang Bass in excellent condition. The serial number is MX20056112.
 
Specs:
Body Material: Alder
Body Finish: Road Worn Nitrocellulose Lacquer
Color: Black
Neck Material: Maple
Neck Shape: C
Radius: 9.5"
Fingerboard Material: Rosewood
Fingerboard Inlay: Aged Pearloid Dots
Number of Frets: 19, Medium Jumbo
Scale Length: 30"
Nut Width: 1.625"
Nut Material: Synthetic Bone
Bridge/Tailpiece :4-Saddle Mustang Bass Strings-through Body
Tuners: Standard Open-gear
Middle Pickup: Custom Seymour Duncan Split Single-coil
Controls: 1 x master volume, 1 x master tone
Strings: Flatwound
 
Ships from Athens, Georgia with a gig bag.