The NEC 3D is a popular monitor for use with the Amiga. I've never had one, so the following information is somewhat sparse (submissions are welcome).
A common complaint is that it is impossible to adjust the picture width to fully eliminate the large black borders on the left and right of the image.
Specifications
Sync Frequency: 15.5 kHz to 38 kHz Horizontal
50 Hz to 90 Hz Vertical
Dot Pitch: 0.28mm Trio
Resolution: 1024 Horizontal
768 Vertical (Interlaced)
Input Connectors: DB9 or HDD15 (maybe earlier models had the DB9)
Pin-Outs (HDD15 Analog RGB)
Pin 1: Red Video
Pin 2: Green Video
Pin 3: Blue Video
Pin 4: Ground
Pin 5: Ground
Pin 6: Red Ground
Pin 7: Green Ground
Pin 8: Blue Ground
Pin 9: Unused
Pin 10: Ground
Pin 11: Ground
Pin 12: Unused
Pin 13: Horizontal Sync
Pin 14: Vertical Sync
Pin 15: Unused