FIRST DAY CANCELS 1892 Seven Star provisional set of four in blocks of four, each stamp cancelled by purple rectangular 19 Apr 1892 pmks, lot includes important letter verifying usage dated 26 May 1892 sent by the Chief Postmaster in Rarotonga confirming that these are the first ever stamps sold, a major item of Cook Islands Philately Estimate: € 1’500 – € 2’000 (Image)