M-TBD: #202 Germany
4 1/4" - 3 5/8" - 3 1/4" X 4 1/4" (104mm - 92mm - 83mm X 107mm)
(crown incuse) 138 {Porzellanfabrik Hermsdorf Klosterlausnitz}
Picture courtesy Bob Berry |
This is a two part insulator - the inner most skirt is cemented into the upper two.