In the absence of marks and from the images this is a silver alloy metal teapot and not a sterling silver piece. Silver alloy metals do not have a precious metal melt down value like sterling silver. This was likely produced in China in the late 20th century. On today's market, the value of your teapot is under $30. To be definitive about the type of metal this is made from, I do recommend that you have this tested at a gold/silver buyer shops. There are stores of this type in most towns and all cities. They do test metal for free right in front of you.
Just checking in to see if you viewed your answer and if you are seeking further assistance?
Please let me know.