Built to the design H677 casemate for an 8.8cm PaK 43/41 for a bunker in a built up area. There are several bunkers in this area built like this with sharp corners and straight walls. They are for placing next to buildings to blend in with their surroundings. Most other casemates have rounded corners and no sharp edges.
Above : an H680 at Morsalines.
Above : an H677 also at Morsalines but with rounded shape.