Not much can be seen in this photo. Look at the openings in the housing, the wires are probably pressed into them and are wedged by properly profiled metal plates. Use a multimeter for ease of use.
Polish production ("Elda") cord switch (authentic string instead of chain) has a cuboid shape and is screwed on the wires. It also has holes for screwing the switch itself with wood screws.
And I'm looking for something like this: It switches on once 2 lights up the second one but goes out first 3 shine both 4 goes out I have one but no markings.
