The OB 5cm Kw K is a World War II-era German coastal defense bunker located in France. This structure was part of the Atlantic Wall fortifications built by Nazi Germany along the coast of occupied France. The designation 'OB' refers to 'Oberbau' (upper structure), and 'Kw K' indicates it was designed to house a 5cm Kw K (Kampfwagenkanone) gun, typically used for anti-tank and coastal defense purposes.
Situated near the coast, this bunker would have formed part of a network of defensive positions intended to repel Allied amphibious landings. Today, it stands as a historical relic of the extensive military engineering projects undertaken during the war.