MIVA T-1 power insulator, in dark green glass. Not listed in GIFONA. There is also a different sized sibling, the MIVA T-2. Vintage is 1920-1930s. This is the same T-1 from an earlier group photo of "5 from Italy, 1 from Russia". Dimensions are 112 mm base diameter, 97 mm height, 33 mm pinhole. Roughly 4.2" dia, 3.8 in tall, 1.3 in pinhole diameter