The meter on the right hand side can't be working, no neutral attached.
A 1 Ø meter requires at least 3 wires to work. Phase in , Phase out and neutral.
My guess: you only see the line side wires, the load side is drilled straight through the wall behind the terminal cover.
The US "silent" toggle never really made its way to Europe. The old toggles had a solid chunk of porcelaine or bakelite moving inside whereas the modern switches only have a small brass plates requiring far less operation force. That's why people feel such a big difference between the old toggle switches and the modern "flat" rockers and are so surprised the old look is still so common in the US.
