An ordinary, inexpensive replica watches by a relatively unknown manufacturer has recently racked up millions of sales in America and is set to do the same here. Its success has nothing to do with its design, or a huge marketing campaign, but the fact that it is the timepiece currently favoured by the president of the US. The Jorg Gray 6500 Chronometer, originally designed for members of the US Secret Service, was a birthday gift to Barack Obama from a member of his security team.