This is very interesting to me. This is one of the 4 main battery 12in turrets from the Russian Battleship Poltava, damaged beyond repair by a fire in 1919. This particular mount saw a good amount of action at Sevastopol during the German Invasion, and was reported to be in service all the way into the 1990's!
The Grand building in honor of commissioning the battery Lindemann" Battery Šlez-GIA-Holstein was renamed on the personal order of Hitler in honor of Catiain Lindemann who was captain of the battleship Bismarck, who was killed along with the ship May 27, 1941 in the Atlantic. Hitler personally ordered to make concrete casements for the guns (formerly guns were for bronevymi boards with thickness of 50 mm). The battery was equipped with three 400-mm cannons .
'R' class battleship HMS Resolution alongside 'Queen Elizabeth' class HMS Valiant early in WW2. Though both mounted 8 x 15 in guns the 'R's (a later design) had reduced engine power to economise after the expense of the 'QEs'. They had less scope for modernisation, being too slow, and overall were much less successful as a result.