There's a small letter at the plastic housing where battery sits. I have three Dincs and the first one showed "B" and the manufacture date is 05/04. The second one showed "C" and the manufacture date is 06/13. Min third one showed again "B" and the manufacture date is 05/08. I guess this is some kind of batch number. Overall, batch "C" has the pink screen but better call quality. batch "B" has cooler color screen which I perfer, but the call quality is worse. As VZW rep told me they are working on the software fix for the call quality, I am not sure if I should keep the batch "B" one and wait for the fix or choose the "C" now with better call quality. Any idea?