I treated myself to a pre-loved Rolex Air-King. I was having trouble finding a new one with a salmon dial and arabic markers. I got a great deal on one on eBay and absolutely love it, but the seller didn't mention a chip in the crystal. I expected some normal scratches on the band, but the chipped crystal is driving me crazy. The seller has offered to give me $75 back but I don't know if I should accept. I love the watch and don't want to return it. I'm not sure if the watch was damaged in transit (I paid for shipping insurance) or if it was just not disclosed. Should I open an eBay dispute or accept the $75? How much will a crystal replacement cost?