Little cups were brought home by Methodist missionary nurse Dora Wilson after her internment in Japan.
Dora was one of eighteen nurses taken from Rabaul New Britian to Japan in 1942.

They were bought with money the Rabaul nurses made folding thousands of envelopes and knitting small bags
at the the pre-war American Yokohama Amateur Rowing/Yacht Club on the shores of Yokohama harbour where they were interned..

On the 18th of August 1943 the nurses were moved to the Yokohama Police station for 13 days.
Whilst there they discovered a bag of the cups pictured below.

The inscription on this cup reads:
Great Japanese National Defence Women's Association
Yokohama-shi Naka-ku [Yokohama City Naka Ward] branch office
Yamashita-cho branch