OB 5cm Kw K is a military bunker located in France, near the coordinates 48.44155263092442, -4.778876863705722. The designation 'OB' typically refers to an 'observation bunker' in French military terminology, while '5cm Kw K' suggests a connection to a 5cm Kw K (Kampfwagenkanone) gun system, commonly associated with German armored vehicles of World War II. This structure likely served as a defensive fortification, possibly part of the Atlantic Wall coastal defenses constructed by German forces during the occupation of France.
The specific location in Brittany indicates its role in protecting the coastline from potential Allied invasion attempts. Today, such bunkers remain as historical relics of the region's wartime past, often visited by military history enthusiasts and urban explorers interested in World War II fortifications.