This is the build that retina macbook pro 15'' ( model: MacBookPro10,1) had out of the box with better battery life and performance as compared to the newer Mountain Lion.
as requested by tomfox
Mac OS X is renowned for its simplicity, its reliability, and its ease of use. So when it came to designing Lion, Apple engineers had a single goal: to make a great thing even better. They searched for areas to refine, further simplify, and speed up — from little things like ejecting external drives to big things like installing the OS. In many cases, they elevated great to amazing.