Turret
It is not a turret strictly speaking, but the gun's mounting on the central dowel same as 12-inch guns of Oro or Isosari island sin Finland. All the construction is covered by metal case for weather defence.
Next photo ->
> Coastal Artillery: Main Kuivasaari Suomenlinna Isosaari Santahamina Russarö Örö Bolax Rjevka Ristiniemi Tuppura Tiurinsaari Bjorke Puumala MU-2 Vara battery Kvarven Fort Odderoya Fort Femore Fort Hemliga Fort Landsort Arholma Jarflotta Fiskar Fort Austratt Where is it Maps Links Videos
manufactured by Goss.Ru