Two iPhones in iTunes Manage Devices

I just checked out the Manage Devices page in my iTunes and see that I have two iPhones listed. Not sure if I should remove one or not. They seem identical apart from dates (one is 9/12 and the other 10/11) and the newer one has ��� instead of an apostrophe in the device name.

Is it safe to remove one? How can I tell which is actually my current iPhone 5? I assume going by dates, but I also had to exchange the 9/12 iPhone due to manufacturing defect.

Thanks!