Sorry for my English.
A Sony Ericsson prototype came to my hands, the SE123, I had never seen this device and I searched Google but I found nothing, just something from the year 2006 of a prototype called the same name but clamshell type. The device only vibrates when you press the power button, carefully opened it and take pictures, the board is Panasonic, it is the slider type with a keyboard under the screen. Under the battery it is written that it is only a prototype and not for sale and uses a Sony Ericsson BA850 battery.
If anyone knows anything about this I would appreciate your comments.
The screen is 5.7 ", the length is 7", the width 2.9 ", and 0.66" deep.
I put the links to the images hosted on Google Drive, but I don't think it shows them