It is ...
Kaan Uslu, M. Fatih Beyazit, and Tuncay Kara,
“Osmanlı İmparatorluğu Madeni Paraları / Ottoman Empire Coins”,
2 volumes,
Istanbul 2007 & 2010.
I asked someone who uses USK in their selling listings, and received a reply just now -
so those two volumes are what he uses.
Also here are the pictures I found of the books ...
1099 to 1255 years 1255 to 1336 years