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I have April 14, 15, and 23rd. No activity though except 2/0 "move" on April 15. It sounds like super last-second final testing.

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What if those initial activity dates are dates of manufacturing/Watch OS install? And final QC the eve before launch? Would be interesting if a correlation could be made.

Perhaps, but I don't have the energy to care enough. I got my watch :p
 
Mine had some for April 10th and 11th, should be from testing when the watches were first turned on after production I assume
 
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