Thats a good question EvenMatt! Our company, Gray and Sons, has been in business for 35 years. We have 6 swiss trained watch makers and jewelers in house to certify all of our merchandise to be authentic. Everything we buy and sell, whether it be online, in our store, or through bitcoin, has our guarantee of authenticity. We also offer a 10 day no questions asked return policy where if you aren't satisfied with the product, you can return it to us within 10 days and you will be refunded 100%. Check out our website grayandsons.com , email us brian@grayandsons.com, or call  +1(305) 865-0999. -Brian