It looks just like the natural matrix on the stone on the other end of the cuff (photo #3). Gap 1"; width 3/4"; Circumference minus gap 4 7/8 (all measurements approximate). Exact era & provenance unknown, so please see all photos to judge for yourself. Check out my other vintage Native American & Southwestern items!The item "PHENOMENAL vintage turquoise cuff bracelet FRED HARVEY ERA Southwestern sterling" is in sale since Wednesday, September 8, 2021. This item is in the category "Jewelry & Watches\Ethnic, Regional & Tribal\Native American\Bracelets". The seller is "cat*not*included" and is located in Luverne, Minnesota. 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, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, 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.