its known as Bronze Metallic in the UK, in real life it looks exactly like Sterling Grey Metallic

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2006 E53 X5 3.0D Sport Carbon Black, Premium Sport Package, Exc Light Beige Nappa Leather, Titanium Grills & Vents, Titanium Interior, Titanium Skid Plate,
Mk4 Sat Nav, TV, Bluetooth Comms Pack, 20 Inch Rims, DSP, Flared Arches, Heated Seats, Tints, De-Badged