Been doing some tidying up prior to our impeding bushfire season and choosing items to put inside my fire safe, when I came across this module, but cannot recall what its from. At the moment I have No idea where I have put the crate of the remaining lot I own, as it would have to be 30 years ago I got a huge number of these type of modules.

Anyways can one able to identify this one? and maybe even some circuit diagram for it?