Chinese characters signature? Yixing (Characters identified: 吴亮屏) What are the symbols on this very old teapot? It appears to be traditional chinese characters or a date?
it's 吴亮屏.

if you do a search online, this is kinda famous kind of 紫砂壶 click

however, the stamp looks different from what I see online, so not sure if it's real.