Never seen such a plug before in my life, but I have spent very little time anywhere near Ticino In Italy I have mostly seen (https://www.plugsocketmuseum.nl/I

Never seen such a plug before in my life, but I have spent very little time anywhere near Ticino In Italy I have mostly seen (https://www.plugsocketmuseum.nl/Italian1.html https://www.plugsocketmuseum.nl/Italian1.html) 1,2,4,5, schukos like 17a and when lucky schukos like 9 and 10; I have never seen most of the others.