Jaw Reservoir lies to the north of Duntocher and Clydebank, and records refer to a World War II concrete bunker, and emplacement, which lie to the southwest.
The record suggests the bunker and emplacement may have been associated with the Douglas Muir Decoy, which lies some 1.5 kilometres to the west, but give no further details to substantiate this suggested connection, and there does not appear to be any reference available to confirm that this was an operational decoy.
It may never have been completed for some reason, or abandoned in favour of the nearby Douglas Muir Decoy.
Construction follows the standard pattern for a decoy control bunker, with the protective earth banking still in place around the walls, and the emergency exit hatch, which could also be used as an observation window, still in place on the roof.