Cover franked with single 1892 2½d blue 'Federation' issue (SG 3) cancelled by good strike of the undated COOK ISLANDS P.O. RAROTONGA cancel in black with RAROTONGA cds dated 7 AP 1893 alongside. Addressed to UK with light strike of New Zealand transit cds and British arrival cds on reverse. A couple of light tones but a very rare commercial first issue cover.