You have to smile at the idea of a conference devoted to discussing the ‘the business of Apple Watch‘ when there’s only one company which knows the real numbers, and that company isn’t telling. But that doesn’t, of course, stop people guessing.

Fortune‘s Philip Elmer-DeWitt helpfully rounded up some of the numbers presented at the Glance conference. Asymco’s Horace Dediu has projected that Apple will hit 21M sales in the first 12 months. Assuming the numbers skew heavily toward the Apple Sport, that gives the company somewhere around $8B in revenue – or more if they don’t. Creative Strategies’ Ben Bajarin believes sales will hit a staggering 100M by 2017.

Some estimated percentages were also presented …

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