That's right, just a frame with no back which the various types styles of bakelite front screwed onto. An optional paxolin sheet was available which could go behind the frame. I installed three of them in my previous house in 1983 and one in the current home in 1994/5.
The moulded plastic back was available well before the wooden version was withdrawn.
I often saw them mounted on a couple of vertical bits of 1"x1" to provide plenty of cable access.
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