The yatağan in the Topkapi Palace armoury has signature on its back (Work of Ahmet Tekeli). Ahmet Tekeli, member of the court jewelers organisation is also mentioned several times in Court payroll record books (books of Ehl-i Hiref) of Kanuni Suleiman's era. One example lists the presents given by Suleiman Khan, for Ramadan Festival to court jeweler and koftgari master Ahmet Tekeli(3000 coins and a kaftan with spots). Ottoman court is famously very obsessive about keeping records of every small detail.
And , I believe Ahmet Tekeli is the decorator of these blades, not the bladesmith.