Hand-painted navy cup with IJN flag and
Japanese battle flag. In between is the wood
sorrel (
katabami)  kamon, a very old crest
famous among the martial class because of
the seed's fertility. And also because a sword
emblem could be inserted so effortlessly; note
the pointed shapes between the petals. The
characters read 'Navy Discharge
Commemorative, Ueno.'
From the Russo-Japan War of 1904-5.
Big kamon (family crest) in the center. This
crest is the
takanoha, or falcon feathers. The
falcon was highly prized by the warrior class
because of its combative, free spirit.
The characters read 'Japan-Russia, Victorious
Return Commemorative'.
'Korea Defense, Engineer 12th Division,
Ichikawa Tojiro.'
Here is an exceedingly rare Kempei-tai (Secret Police) sake
cup, and a naval one, too.  Inscribed 'Retirement
Commemorative, Kempei Special Duty Sergeant-Major
Nakagami'. In addition, a kamon (family crest) is above the
flags. Looks like a
tomoe crest.
This crest appears to be the karabana, or Chinese flower.
Since this crest was used by the court aristocracy (not the
warrior class), this was probably the individual soldier's
personal
kamon. Inscribed 'Military Service
Commemorative'.
Kamon (Family Crests)
The kamon were--and still are--widely used in Japan. There is a huge variety of crests and
tons of variations on each crest. Since crests appear on non-military cups very often, I will
exclude them. Here I will show crests found on military cups only. For some unknown
reason, family crests rarely appear on military cups. Perhaps they were seen as too
individual--once a soldier entered service, his duty was to the Emperor. That could be one
reason.

Some kamon were known to be martial symbols so they could have been used as a general
symbol of warriors. Or they could have been the soldier's personal crest. It is impossible to
tell. However, if the crest is not one used often by the warrior class, one can safely assume
that it belonged to the soldier's family.
This crest is the takanoha, or falcon feathers. The falcon
was highly prized by the warrior class because of its
combative, free spirit.
The characters read 'Imperial Guard 2nd Regiment'.
No inscriptions; it could be a civilian cup. Hoshi crest,
usually associated with Buddhism. Stars in the East were
traditionally circles, not the five-pointed star like the West.
Army star and a kamon (family crest). This appears to be
the oak crest, one of the more popular crests among the
warrior class, particularly among those devoted to the
Shinto religion. Inscribed '3rd Division, Discharge
Commemorative'.