This is a glass Insulator in very dark green colour (almost black). To see the green colour you must approach a powerful light near the surface. On the third shed there is the emboss VF 3-12. This emboss takes us back to another larger specimen that is embossed 3-35 NAPOLI and probably manufactured by Vetreria Merdionale Ricciardi in the '10s of 1900. This specimen has been rescued in Marche region by me.