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I googled.
The 6 implies the dust protectiveness.
The 8 is the water protectiveness.I think 8 is manufacturer determined, but specific to a task, and should imply above IPX7 but actually does not because usage scenarios differ.
Simply: No smart watch is a swimming/diving watch, unless you've bought a Suunto and maybe one of the Garmins (though I'm not totally sure on that either).
Velocio-
Actually Sony state that swimming in a chlorinated pool is a supported activity:
http://support.sonymobile.com/global-en/swr50/userguide/Water-resistance---AccCA/
mashton
IP68. But I think that was a typo on your part.
I don't think I'll be warranty covered as I got it second hand on eBay.