Civil War Berdan's Sharpshooters hard rubber Goodyear patented button. This would have been for an enlisted man in Berdan's Sharpshooters of the Union army during the Civil War. Officer's buttons had a different design inside the shield. It is 15 millimeters, so I believe it would have been for a cuff. This is a super rare find, and it's in excellent condition.
The eagle still has a great raised outline, and can be clearly seen. Inset brass shank with the Goodyear mark. The item "RARE Civil War Berdan's Sharpshooters Uniform Goodyear Rubber Button 15mm" is in sale since Monday, July 1, 2019. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Buttons".
The seller is "rosemary5325" and is located in Gilmanton Iron Works, New Hampshire. 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, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Russian federation.