Line-of-Gaps / Kennedy Town PB 4 / LPB 19, Kennedy Town [c.1941-????]
HKBU's The Battle of Hong Kong 1941: A Spatial History Project recently rediscovered a long forgotten HK Island PB, and added it to their map as LPB 19 (see https://digital.lib.hkbu.edu.hk/1941hkbattle/en/map.php and tick 'HK I Pillboxes' under 'Structures').
For this page on Gwulo I've adjusted the position of the marker slightly, moving it to an adjacent open space, based on the PB's probable construction date and a post-war aerial photograph. That area is now Exit B1 of the HK Uni MTR Station.