It is a classic "Chip Inlay" technique, Peyote Bird and Drums themed design, of that time frame. It is stamp signed "SD" with a hallmark depicting the maker. It is not stamped "Sterling" on reverse of the buckle. It is guaranteed to be Sterling Silver.
There is a heavy tarnish. The Turquoise and Coral "Chip Inlay" is all intact and solid!
It is worth examining in the magnified pictures. I believe it will please you.. As the Navajo say, "Walk in Beauty".I thank You and look forward to sharing a good experience! "AMERICAN INDIAN JEWELRY I" - Gregory Schaaf - page 265. "AMERICAN INDIAN JEWELRY II: M-Z" - page.
"HALLMARKS OF THE SOUTHWEST"- Barton Wright - page 156. THE LITTLE BOOK OF SOUTHWESTERN SILVER - Billie Hougart - page. "ZUNI JEWELRY" - Theda and Michael Bassman.
"ZUNI THE ART AND THE PEOPLE VOLUMES 1-3" - Barbara & Ed Bell- Volume. "KNIFEWING AND RAINBOW MAN IN ZUNI JEWELRY". For reference only Buckle W Singer. The item "WILLIAM SINGER NAVAJO BELT BUCKLE Sterling Silver Turquoise & Coral Tommy's Bro" is in sale since Wednesday, May 20, 2020.
This item is in the category "Jewelry & Watches\Ethnic, Regional & Tribal\Native American\Other Native American Jewelry"." and is located in Tucson, Arizona. 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, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Russian federation, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Ukraine, Cayman islands.