This piece is from the mid 90s, the whole purpose of the ‘in•ter•active’ series of jewellery designed by Takao Yamashita, was to make something that is multifunctional aswell as aesthetically pleasing. The ring can also be used as a functioning whistle.
 
Condition: 7.5/10
some of the black has worn off the letters, can be seen in the pictures.
 
Measurements:
17mm diameter