Looks old and not so 'vintage'. Looks kind of custom because of the individual plates for each jack. Also, It looks old becasue the XLR connectors are backwards, like male on the board (unless they were all outputs) should be female inputs on a mixer, though years ago, (long before my time) they used XLR the other way around. I have a mic I had to switch the jack on for the cable because of this. Come to think of it, your mixer looks like an PA (Speech type) that I used a few years back. Sorry, I don't really have great info...
--MIKE