Posted 6 years ago
Whitall Tatum was one of the earliest glass companies in the USA. The company started in 1806.
This insulator is the Whitall Tatum No 1 which was produced from 1922-1938. The company was purchased by another company after that and production of these insulators ceased.
CD 154 is the style of insulator. Many different companies would make similar models with variations.
Purple is good in insulator collecting. It seems to be a bit more common for Whitall Tatum insulators.