From all the items displayed, my attention was drawn to a series of scale models representing atakebune, unusual Japanese warships from the 16th century (the middle of the Sengoku "Warring States" period). These ships, armed with cannons and arquebuses, were used to patrol around the islands and, as you can see from this picture, atakebune were more like floating fortresses than warships.
It is known that the famous Oda Nobunaga used in 1576 a fleet of 6 great atakebune, but there is very little information about them. It seems that these Ō-atakebune were covered in iron (they were also called tekkōsen "iron armored ships") and this means that Japan has developed the first armored warships in history (more than 280 years before the first ironclad battleship).
EXIF info:
Nikon D300
Lens: 18-70mm F/3.5-4.5G
Focal Length: 29mm
Aperture: F/3.8
Shutter Speed: 1/80s
ISO Sensitivity: ISO 640