Nauru: 1916, OHMS preprinted envelope with oval "OFFICIAL / FREE / POSTAGE" from
Nauru
1916, OHMS preprinted envelope with oval "OFFICIAL / FREE / POSTAGE" from "P.O. PLEASANT ISLAND / NAURU MY 10 16" to Sydney w. May 31 private entry. has a April 29 1916 dateline.
Condition: Cover