1893, Cook Islands.
Registered cover from Rarotonga Oct. 9, 1893 to Ipswich, bearing set of four (S.G. 1/4), tied by four fine strikes of Cook Islands P.O. Rarotonga circular stamp in violet. Backstamped "Registered/Auckland" double circle datestamp and "Ipswich Dec. 7, 93" in circle on arrival. Very fine.