(IDEX Online) - A unique Rolex Yacht-Master, made entirely of platinum for the company's then CEO Patrick Heiniger, is to be sold with an estimate of ???EUR? ?1m to ???EUR? ?2m ($1.1m to $2.2m).The dial features diamond hour markers with baguette-cut sapphires at six and nine and a triangular-cut sapphire at 12.It was presented to Mr Heiniger, who took over from his father Andre Heiniger in 1992, to commemorate the Swiss luxury watchmaker's ten-millionth chronometer movement."The watch is made of the rarest of metals with an incredible unique dial and it comes with outstanding provenance directly from the family that marked the history of the Rolex company," said the Monaco Legend Group, which will auction it at its Exclusive Timepieces sale this weekend (April 22 and 23) in Monte Carlo. Pic courtesy Monaco Legend Group