Here is a video about the types of leather the Hamiltons come in and comparison. Jojo is correct , that is the pebbled leather. I learned something new today! The pebbled leather I am used to is much bumpier with little 'pebbles' in it! I guess I got used to that COACH pebbled leather, which is real gravel like and bumpy. . But I do know the lambskin Hamiltons are the quilted bags, and your bag is not quilted.Hope this helps.... please authenticate is this also lambskin?
https://www.youtube.com/watch?v=CD_NbuRu7Tc