It was used once on a job and then stayed in the studio for a few years, no known scratches or issues. I have the original box and I am happy to send a short video of the mixer working upon request. 

This is the general description of the unit pulled from B&H.

"The Mackie 1604VLZ4 16-Channel 4-Bus Compact Mixer includes a combination of Onyx preamps and a high-headroom / low-noise design. All 16 channels feature an Onyx microphone preamplifier, line input, and insert in a compact 4-bus design built for application flexibility and professional performance.

The mixer is built-like-a-tank with a rugged solid-steel chassis and high-contrast controls for tactile control. It is a band-friendly analog mixer used in professional broadcast and post facilities. The 1604VLZ4 includes a pair of rack ears and a power cord.

16-Channel mixer featuring high-headroom, low-noise design
16 Boutique-Quality Onyx Microphone Preamps:
  • Wide 60 dB gain range
  • 128.5 dB dynamic range
  • +22 dBu line input handling
  • Extended frequency response
  • Distortion under 0.0007% (20 Hz to 50 kHz)
Improved RF rejection, suitable for broadcast applications
Phantom power for condenser microphones
16 high-headroom line inputs with +4 / -10 operation control
16 balanced inserts suitable for integrating outboard gear
3-band EQ with sweepable midrange
18 dB/octave 75 Hz low-cut filter on microphone input channels
Four AUX sends, level, pan, and solo and overload / mute LEDs on each channel
Four stereo returns, eight direct outs and four group / bus outputs
60mm long-wearing log-taper faders
Control room / phones multi-input source matrix
High-resolution 12-segment stereo meters
Sealed rotary controls resist dust and grime
Built-like-a-tank rugged steel chassis with powder coat finish
High-visibility, high-contrast controls deliver convenient at-a-glance visual feedback
Rack-mountable design, includes rack ears
Multi-voltage power supply for worldwide use
Applications: live-sound mixing, houses of worship, clubs, gymnasiums, banquet halls, conference rooms, boardrooms, multi-track studio and field recording, video postproduction, multimedia applications, broadcast, and many more."

Do not hesitate to reach out with any questions.