Q. Dear Rov I was at a wedding recently and I saw that the signature of one the witnesses at the Ketuba (marriage document) was almost illegible, you could not tell who signed it. Is that Ketuba Kasher.
Does the marriage ceremony have to be repeated?

A. Lechatchila (on the onset) the witnesses should write their full name and their father’s name clearly and without abbreviations, so anyone who reads it will know who they are.

However, after the fact the Kesuva is acceptable when legal signatures are on it. (Yafe La’alev E.H. 66: 5, Teshuvos Vehanhogos 1: 758, Kesuva Kehilcheso p. 53}

Horav Shlomo Miller’s Shlit’a opinion is similar.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller, Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit’a