Mauritius. (Perfin Stamps). 1943. Envelope addressed to New York bearing Mauritius SG 254, 4c green (2) and SG 257, 12c salmon tied by General Post Office/ Mauritius double ring '19th Feb 43' with 'Opened by Examiner/ E.E./ 1' label. Interesting item with stamps perfined by "Blyth Brothers & Cp'.