This is a historical italian insulator called 1/1920. The three insulators in the photo have been produced by VACCARI and have three different ink markings: LIGURE, LIGURE VACCARI, and V in a rectangle. This last one dates 1958. All manufactured in the factory of Genoa. Click on WIEW ORIGINAL to see the marking details. Described in the 1926 FIL catalog as the standard insulator for the Italian State Telegraph lines (in the green striped variation)