I'm considering selling a pair of 10x42 El Swarovski's that I purchased from an authorized dealer with the full USA lifetime warranty. The EL's are in excellent condition and have been used very little. My primary optics are 8x Swarovski's. I called Swarovski and asked if the warranty was transferable. They looked up the serial number of my binoculars to check registration and said yes, the lifetime warranty was transferable. All I need to do is type up a brief letter explaining the sell and give a copy to the purchaser and send another to Swarovski. Swarovski will then transfer the serial number to the new owner. When you spend that much on optics, you truly get what you pay for.