The watch chain comes from a remaining stock of a former jewelry company in Idar-Oberstein, I have many more such and similar watch chains. These are the chains not about real gold or real silver chains, if only gold-plated or silver-plated or Nickel or chrome. Since these necklaces were probably made during or after the war years, and gold and silver were very valuable at that time, this jewelry was usually made from other materials. I don't know the exact age myself, probably from the last production times of the jewelry company! Since I have a lot of these necklaces and have already sold quite a few, you are welcome to look at my reviews, from which you can see that my buyers are consistently satisfied with the goods. Here is some more information about the GPSR information requiremen.
eBay