Here a new marking of the MIVA ACQUI factory. There's written MIVA ACQUI - PRODOTTO ITALIANO, with the drawing of the nation below, and the PYREX inscription on the bottom. This is not an insulator, but the glass of an ancient oil lamp, in use many decades ago on the FS, Italian State Railroad Co. This object dates the period of autarchy, during fascism. Thanx to my friend Vito for this exciting discovery!

Note: here I used a white paper sheet inside the glass to show the ink marking better