Belleek, Shamrock, Moustache Cup, Black Mark
Belleek
Moustache cup and saucer
Cup, diameter 4.25 inches (excluding handle)
Saucer, diameter 5.25 inches
Note, the saucer is the same period shamrock pattern. It seems a little small for the oversized moustache cup. However this may be as intended.
No damage
Near zero wear