Why the mystery turret looks more like 14-inch than 12-inch

Could the photographed triple turret be a Vickers mounting offered for a Japanese battleship, and how certain are its calibre and date?

A Japanese connection is possible, and the 14-inch identification is more convincing than the handwritten 1909 date.

The question connects Vickers' Japanese work with Fuso and Kongo proposals and asks whether the mystery image could show an offered triple mounting. The photograph is marked Vickers and carries the number 1909, while accompanying notes identify the weapon as 14-inch. Its barrel proportions and shape look closer to a 14-inch gun than to a 12-inch gun, unless the latter had been very heavily rebuilt. Confidence is stronger in the 14-inch identification than in the date, and both still require archival corroboration.