The coastal pillboxes were numbered anti-clockwise around HK island, from 1 to 72, so this was the one with the highest number.
The map is not very clear, so the location is only an estimate. If it is still there, it should be visible from the ferry to Lamma - I'll take a look next time I head out that way.
If you have any memories or photos of how this looked, please leave a comment below. <Read more ...>