Couldn't care less in terms of being concerned but the lighter one that looks like a half space grey was a replacement my dad got a coupla months ago. Mine is an original iphone 5 from November 2012 that looks a lot like the other iphone 5 I had from not far around that time frame (sold to try nexus 5 and re bought another when evasi0n7 jb came out) Of course the lighter one is more worn but I'm beginning to buy into there being different degrees of slate out there that I read long ago. The antenna bands are also more noticeable on the lighter one. Could be a production correction or just different factories making these things is my guess. Thoughts?