Size:171mm X 107mm (6.75" x 4.25") Example in Photo: Lapp) (USA) Photo Credit:Zac Mirecki Patent:1,663,421- Patented March 20, 1928 Note: This odd guy strain has a standard (for the US) 1 inch standard pinhole. See above patent for info on how it was used.
Direct link to this insulator:
(Under-glaze Ink) LAPP
(Under-glaze Ink) LAPP / G42 // K7
Size:127mm X 88mm (5" x 3.5") Example in Photo: Unknown (USA) Photo Credit:Mid Norris