This is a genuine caseback, from the 16610, it is in very good condition with one area where the caseback tool has left some minor marks, nothing bad, please see the pics, I have multiple images of the described mark, its in one section only. On the inner side where the gasket interfaces, its perfect, no markings, what you see in the pic is some residue. Asking 320 shipped in the USA, via usps priority mail with delivery confirmation and signature (upon request) thanks for looking