Named ship cups page 5
Lacquered wood cup with gold gilt  Imperial Paulonia Leaves. This is a
named warship cup, from the battleship Fuso. The inscription on the
reverse reads, 'Showa 9 [1934] On the occasion of the Honorable
Prince Takamatsu Boarding the Battleship Fuso Commemorative'.
Prince Takamatsu was a younger brother of emperor Hirohito, and he
was in the Imperial navy. According to the Wikipedia entry, he also
served on the Fuso twice.
Named Navy warship cup. The hand-painted design in the bowl is an
impressive dragon spewing gold fire. Inscribed 'Tenryu [literally "Heaven
Dragon"] Launching Commemorative'.
Read more about this cruiser here: TENRYU.

This ship was launched on March 11, 1918, so this cup can be dated quite
easily. She had a long career and saw considerable action in WW2, finally
being sunk in 1942 near New Guinea.
Inscribed 'Conquer Germany Commemorative, Yakumo, Takahashi'.
Warship Takasago
Note the White Ensign British Naval flag. This cup commemorates
the enthronement of Edward VII in 1900. The Takasago was sent
to England then as a representative of Japan, and also to show
the world Japan's naval power.

Warship Nagato (cup dated 1928)
The mighty Nagato, which came to such an inglorious
end as a target for an atomic bomb test in 1947
Warship Tsushima
Warship Chikuma, a cruiser that fought in some of the most
famous battles in IJN history: Pearl Harbor, Leyte Gulf, Wake,
Midway.

This cup can be dated to 1940-41 since it is inscribed
'Southern China Dispatch' and the Chikuma was dispatched
to this area 3 times during '40-41. Most named IJN warship
cups come from an earlier period (usually 1920s), so this is
really a rare example of a 1940s named warship cup.