Sales of that magnitude would have more than covered the supermodel's reported£3 million design fee, at a stroke repaying Topshop tycoon Sir Philip Green's faith in the venture.
According to industry sources, the Moss range achieved sales of between£3 million and£3.5 million across Topshop's business. 'That's a good number,' said the chief executive of one rival fashion retailer.
The publicity generated by a blizzard of media coverage is worth another£2 million to£3 million in the UK alone, retail marketing experts believe.
Green would not comment on the sales figure, but said: 'It's all gone according to plan so far.'
The range, which drew hordes of shoppers to Topshop's flagship Oxford Street store for its launch at the end of last month, created a similar sensation at New York department store Barneys when it went on sale there last week.
Green is now on the hunt for suitable premises to open Top-shop in New York. He said: 'We're actively looking. We'd like two or three sites, but it's like London - you need the right sites.'
Green regarded the launch of the Moss range in the US as an acid test of Stateside potential and decided to proceed after its sell-out success.