A German Regelbau B1-1 type military bunker located in western Poland, near the former German border. The Regelbau system was a standardized series of bunker designs used by Nazi Germany during World War II for coastal defenses and fortified lines like the Atlantic Wall and Westwall. Given its precise type designation and location in a region that was part of Germany until 1945, this structure is almost certainly a remnant of WWII German military fortifications.
However, specific historical records for this exact coordinates and designation are not present in the provided search results. The surrounding area saw significant military activity during the war and the early Cold War period, but the bunker's precise role, construction date, and unit history remain unconfirmed by the available sources. Current physical condition and accessibility are also undocumented.