Natal 1900 Rare Mexican Wreck Salvaged Letter

1900 WRECK OF THE "MEXICAN": Envelope from Point, Natal (clear cds MR 27 00) to England franked single QV 1d (SG 66). Cover bears a strike in red of the two-line "RECOVERED FROM WRECK OF MEXICAN" cachet. Of the salvaged mails most emanated from the Cape and accordingly covers with non-Cape adhesives are unusual. Some water staining as expected. Rare.
The Union-Castle liner "Mexican" left Table Bay on 4th April 1900 for Southampton. At 2am on 5th April she was sunk by collision with the English transport "Winkfield" in fog approximately 80 miles out.