I think mid century to 1970s. I have not found a marking on it. I think it may have originally had a cabochon in the center but not sure.Pendant is 3" necklace 29". I have had this piece for a few years and have not seen one exactly like it. I have been researching some more since original listing.
I do think this is Jozsef Peri piece. He was a Hungarian artist.I think it is missing cabochon. The item "Vintage Brutalist Bronze Necklace possible Jozsef Peri piece Hungarian" is in sale since Thursday, January 04, 2018. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Vintage Ethnic/Regional/Tribal\Scandinavian". The seller is "redlori1024" and is located in Pinson, Alabama. 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, Russian federation, Israel, Mexico, New Zealand, Philippines, Singapore, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica.