Didn't Germany offer the Dutch a quadruple-turret design in 1913?
Short answerA paper proposal is recalled, but its calibre remains disputed. It would not by itself demonstrate the ability to build a triple 15-inch turret.
NotesA German quadruple-turret proposal for the Dutch raises two separate questions: its calibre and whether a drawing could become a workable installation. The initial recollection is an 11-inch mount, while a viewer proposes 14 inches. That identification remains unresolved after an unsuccessful search, and the possibility of a missed design is acknowledged. Either way, a triple 15-inch turret would impose substantially different weight and stresses from a quadruple 11-inch turret. The example of a Vickers double-stacked quadruple 12-inch design reinforces the distinction between drawing a mount and being able to produce it.