I agree - corrected grain, not shell. Prada is famous/infamous for their use of corrected grain.
I have that same shoe and it's Prada. It's at least 7 or 8 years old. The box says retail was only $490 @ Saks in New Orleans. I know I paid less than $200. The name of the shoe style is cordovan. My pair is showing too many wrinkles for only 3 or 4 wears.