iPhone 6 64gig

I'm selling my AT&T 64G iPhone6. I purchased it in August 2015, so it's about 7 months old. There is a dent my the volume down button but it works perfectly fine. It's always been in a case. My job purchased me a phone and so this one has been laying in a desk drawer. They retail $749. This has the box, headphones, charger and charging cord all unopened. Manual included. I'm asking $600 firm. On Facebook cheaper. WILL TRADE FOR LV SPEEDY 30.