- Base
- Black
- Bottle Height
- Half
- Brand Extended
- Radio Corporation of America
- Country
- Great Britain
- Factory Code
- B - Mullard, Blackburn, B - Mullard, Blackburn
- Glass Color
- Clear Glass
- Mica
- Double
- Permanentid
- 2uy23ccl
- Pin Color
- Silver Pins
- Plate Color
- Black
- Tip Shape
- Round Tip
- Year
- 1960s
