A sterling french ritual cup?

This cup was bought for $ 50 about 10 U$ ten years ago. It was so dirty that we could not guess what it was. The handle with the phalanges of the fat and index fingers call our attention a was the reason behind the shopping. When Sergio polished it carefully the heavy bermeille of the interior appear as all the seals of the silver. We have never used it, never saw another similar and is one of our rarest small Paris tresors. Makers mark for Jules Ladoucette & Pierre Gavard, 17 rue Phélippeaux. Mark registered 1 Apr 1869 & cancelled 2 Feb 1886.