Need help identifying silver vessel


![IMG_3564 (1)|640x420](upload://i9sAOBSn6gxVufkJx7wsqXfgYL8.jpeg

Can anyone give me any insight on the item in photo… it was so back and heavy I assumed it was
plated but it tests silver with both silver acid and 18kt acid… new at this, so appreciate anyone’s insight.
Item is approx 7 in tall and has very delicate spout…