This item was purchased at an antique jewelry collector's estate sale. It's a vintage linked belt in root beer Bakelite by fashion designer Yves St. Laurent, probably from the 1970's. A metal hangtag dangling from one of the round links has the YSL logo.
I've tested the links with Simichrome and they are definitely Bakelite which is such a plus on this great piece of vintage couture. The gold colored connectors are in excellent untarnished condition and the swirly brown Bakelite pieces are also in wonderful condition. I love Bakelite so much, it's difficult to part with this glorious piece.
The length of the section consisting of squares and connectors is 27 inches and the round links could provide additional length, so the size is very adjustable.
It's a superb piece of vintage fashion by a highly prized designer.