there are a million ceramics which look very much alike, but the thread on the outer end of the body should help. But how about some clues...photo of handle???
Alot of those stems will interchange between brands. Measure it wil a caliper and match it up. Its not a grohe stem like I have in stock.......They all have clips below the splines. There are so many cheap knock offs it can be hard to tell from looks.