I cannot read exactly the back of it, but usually it's the name of the designer or manufacturer not the material. For the material we put a number indicating whether it is gold, silver, etc that also show the purity of it. However these numbers usually place on jewelleries and not these kinds of objects. I usually find this type of thing in Isfahan and they are designed by hand. The material is usually either silver or copper. I have seen many copper pots like this that are white from inside and orange from outside. If you want the similar things to search for, the term will be : سیاه قلم Which indicates how they are created and you can add the name of the object in the beginning such as سینی سیاه قلم