Mark Levinson - what have I bought?


I have purchased an early Mark Levinson Preamplifier/Mixer with no model number on it - pre production model. I know that ML made some mixers for Joan Baez biography movie and also a mixer fore Woodstock as well. I also know that his first production line was the famous LNP-2 preamplifier.  Is it possible that I've got the LNP-1 preamplifier or one of the four early mixers he made in the 1970's?  Your help will be greatly appreciated. Thank you.
This unit has 2 large UV meters on the front panel: it is two channel stereo as well as option four channel also: it has four volume pots and four panning pads; one master fader knob; one select knob for mono, off and tape. All the inputs and outputs are XLR connectors. Inside, there are two Burwen amplifiers, and two Burwen Meter limiter units as well. 

pinemountainclub
Have it looked over by a qualified tech.

 Sounds like a great acquisition to your rack!
This is the exact ML rack mounting mixer/preamplifier I purchased, and this is the only picture on the web.  Even, ML side doesn't have a picture of it on their web side.  I also don't see anywhere pictures of LNP-1 preamplifier.  So far, I have been given an advise that only the man who design it will be able to tell me what I've got.   Any ideas?                     

rhttps://www.proxibid.com/Estate-Personal-Property/Music/Rare-Mark-Levinson-4-track-preamp/lotInforma...
This is a microphone mixer, made for the Pro market, not home hi-fi. David Manley did the same, one studio I was in having a Manley mic pre-amp (tube, of course).