Item: Antique Gold Filled Large Twisted Link Watch Chain Fob Layering Necklace T Bar Clip. There are no stamps or hallmarks on it. It looks gold filled to me.
 
Measurements: The chain, clip, and extra piece on the connector measure 12 inches long and 6.5mm wide. It weighs 21.28 grams.
 
Condition: Antique, previously owned. It is showing some minor signs of age/use/patina.