OB 12.7cm Geschütz is a German World War II coastal artillery bunker located in Norway. This defensive fortification was part of the extensive Atlantic Wall system constructed by Nazi Germany along the Norwegian coastline to defend against Allied naval incursions. The designation 'OB' typically refers to 'Objekt' in German military terminology, indicating a specific military installation.
The 12.7cm caliber suggests this was a medium-caliber coastal gun position designed to engage enemy ships at considerable range.