of unknown manufacture, looks to be of recent vintage . I have also posted a different view of this over at "foreign insulators". I received it as a freebie with another insulator purchase.
This one has no identifying marks, and it seems to be of recent manufacture. Dimensions are 3 inches wide, 2 3/4 inches tall. (about 76 mm X 70 mm). The "bottom" end is unglazed.