What's the wiring like behind the panel, around the extra pairs of studs?
My suspicion is that it's for something like a WS52 installation with extra battery pairs (possibly because they were short of the 200 Amp Hour units and had to make do with the 100/125AH ones instead). If so the upper and lower pairs of studs will be connected in parallel behind the panel.
It's also meant to be used with two chore-horse charging sets (according to my reading of the panel lettering). The upper two switches select which batteries are feeding the output terminals (left hand switch) and internal lighting (right hand switch), while the lower pair select the charging source (Chore Horse 1 or Chore Horse 2) for Battery 1 (Left) or Battery 2 (Right).
(On my British charging switchboard No.5, the charging sources are Vehicle Generator/Dynamo and Charging Set.)
Best regards,
Chris.
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