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I was just looking around the web to see if others were seeing this. I just noticed this on my watch today - greenish corrosion you'd get with a copper based metal and the metal is chipping away. I use mine heavily (run 6 days/week and in marathon training as well). Going to search some more on the issue and call Garmin.
There are comments on Amazon on this issue and I think also on this forum.
Some people claim their wrists have gone green and blistered
I've also been dabbling with the idea of getting the 610 but was put off by similar web reports about rusting. The general message seems to be like yours, ringo100, send back and get a replacement.
Long term not really a solution though. Does anybody know if this is a general problem with the 610 or just limited to an unlucky few?
while on the subject... i heard somewhere that all the big 610 Black-Friday price cuts coupled with the 410 bezel/misting/etc problems might lead to the 410 being dropped in 2013, being replaced by re-priced 610 and then a new high end model coming out to fill the 610 gap. Anybody else heard anything like this?