The center piece appears to be part of a belt buckle with a watch for hanging. This was a somewhat common practice in the early 20th century.Parts are sterling And parts are 800 silver. I believe it is pieces of several European countries. Some appear British and some German.
Measures 25 " long with a 4 1/2" drop medallion. If you want attention this is your necklace. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Necklaces & Pendants". The seller is "n7402000" and is located in this country: US.
This item can be shipped to United States.