This is the only remaining specimen of this huge bunkertype. It has an artillery observation cupola and a "Panzerkasematte" that housed a 10cm "Kasemattekanone" and a MG 34 behind a huge armoured plate.
The manufacturing date on the cupola is very late (1943).
This is the roof of the heavily armoured "box" type 405P9. Roof: 350 mm, front: 300 mm, side and back: 250 mm, total weight: 150 tons.
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