- Set manufacture date unsure but may be 1980
- Dial type: 35Y3D, Date: 10-80,
- Color White: 61
- BSP for this phone
This is a one line phone designed to work with an operators headset
![](graphics/2514BM/DSC_6500.jpg)
Headphone jacks
![](graphics/2514BM/DSC_6501.jpg)
Headphone on off switch
![](graphics/2514BM/DSC_6506.jpg)
Special circuit board for headphones. Headphone jacks can be seen in lower left
![](graphics/2514BM/DSC_6508.jpg)
Closeup of top of circuit board
![](graphics/2514BM/DSC_6511.jpg)
Circuit board lifted to reveal an N1A bell not normally found in 2500 series phones
![](graphics/2514BM/DSC_6509.jpg)
4228 type network
![](graphics/2514BM/DSC_6512.jpg)
Terminal board under dial
![](graphics/2514BM/DSC_6503.jpg)
Wireing diagram