You can return an item any time if it is proven to be unauthentic by a generally recognized authority e. G, BPA, CSS, RPSL, etc. Proof that a mutually acceptable authority declines to express an opinion is not grounds for the return. We will try every effort to make sure you are happy. Your 5-star feedback is greatly appreciated.The item "TangStamps US Airmail Stamps #C15 Mint OG NH" is in sale since Saturday, November 3, 2018. This item is in the category "Stamps\United States\Back of Book\Air Mail". The seller is "tangstamps" and is located in Santa Clara, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Viet nam.