Electric guitar · solidbody
Bridge Pickup, Position 2. Bridge and Neck Pickups, (Lead Circuit), 2-Position Slide: Up: Lead Tone Circuit, Down: Rhythm Tone Circuit. controls: Lead Circuit Controls (Slide Switch Down): Volume (Neck), Volume (Bridge), Master Tone; Rhythm Circuit Controls (Slide Switch Up): Two Thumbwheel Controls for Neck Pickup Volume and Tone. construction: Bolt-On. bridge: Adjusto-Matic™ Bridge with Vintage Style "Floating" Tremolo Tailpiece. J Mascis signature, offset
| Body Style | solidbody |
| Body | Basswood |
| Neck | Maple |
| Fingerboard | Indian Laurel |
| Neck Pickup | Single-Coil Jazzmaster® |
| Bridge Pickup | Single-Coil Jazzmaster® |
| Pickup Switch | 3-Position Toggle: Position 1 |
| Nut Width | 42.5 mm |
Artists documented playing the Squier J Mascis Jazzmaster: J Mascis.