I received a few days ago, this teapot gift from a friend of mine.
This is my first yixing teapot ( if it is

The only information I know of is the date of purchase ( summer of 1998, HK).
Therefore, the teapot has a rather smooth surface, both under and inside the teapot I can see indistinctly many circular circles, in particular inside the teapot, what do they mean?
I tried to block the hole in the lid with water inside and the liquid immediately stops.
I really have to say that is a pleasure to hold in my hands.

What do you think could be the type of clay used?
The filter would seem well done, with about 25/30 holes for a diameter of about 2 cm.
I thank all who can help me!
William.
