NF 331 - High speed single needle lockstitch machine with reversible needle feed. Machine has automatic lubrication. Stitch length 4 mm.
NF 331 LH - Same as above, but with large hook and 5 mm stitch length.
NF 331 AUT - Same as NF 331, but with thread trimmer and back tack (solenoid).
NF 331 LH-AUT - Same as NF 331 LH, but with thread trimmer and back tack (solenoid).