I have no history on this board. I picked it up from auction. It’s in very good condition apart from some slight discolouration on the clock bezels.
I would date it from around 1965 give or take. The reason for me thinking that is the incoming and outgoing cables were 3/.029 Single conduit cable and a much better plastic than the early pvc type . So that would give me a rough installation date.
One relay had obviously been sprayed with something like WD 40 and was sticking and the gears on all 
the slaves had been oiled attracting loads of dirt and sticking .
A strip down of the slaves and relay was obviously required . After cleaning, the slaves were correctly oiled and re assembled. The condensers (capacitors) we’re tested and found to be in Tolerance. One relay also required the contacts cleaned and adjusted.
The panel works as it should and is fairly noisy. Andy