Thank you very much for your answer. There is indeed a scratch and numbers that I can't read well, but I ordered a watchmaker's magnifying glass and I think I could read a little better (sorry for my English, but I'm French, and my english is not perfect) . I 'm not home right now, but i will take more picture. The thing is that there is a missing part in the movement, in the 80's, a watchmaker take off the chrono part (brigde etc...)