My name is Nikifor. I have two marks on a 19th C. silver book cover decoration. With the help of this website and other resources I could identify one of them, which (if I am not wrong) is from Vienna, has the year 1813 and shows the purity of the silver which is 13 lot. I couldn't find any information about the second mark, which has the letters A, T, F. I am guessing it is a makers mark but really have no idea. Could someone help identifying it? If you know something about this mark, could you please include the source of your information as well. Thank you very much!
Here are the images:



Best regards,
Nikifor