- Official designation: fw3/23
- Shape: rectangular
- Square pillbox with an integral measurement of 8ft (2.4m)
- Integral open annex containing a mounting for a light anti-aircraft machine-gun.
- Generally loopholes in the roofed part and often in the open area as well.
- Not usually a doorway, but external rungs are set into the outer wall.
Information obtained from Pillbox Typology Part 3 in Loopholes Journal of PSG. With kind permission of Mike Osborne