sterling silver

please help identify this ligature. Buying this ligature of Dukoff Hollywood. It's silver plate, or sterling silver? Thx.

I recently bought this mouthpiece, and a friend of mine from Cologne who has started working on and refacing mouthpieces came to me to look at my Link Tonemasters and play a little bit. I showed him the FL, and he said the slope or angle of the rails towards the tip was not really perfect, too...

I purchased this as a 'Yanagisawa' neck a few months back thinking it was the sterling silver model. Now, trying to sell it, it's metal composition has come into question.....and because it has no markings on the neck, I'm now wondering if it is a Yani neck at all!! Any help in determining if...