Firestone Walker - Walker's Reserve Porter

Just curious, when was the last time Walker's Reserve - Porter was brewed.

I managed to happen across a few bottles on a random shelf and bought 2 for $5.99 a piece. Didn't realize how old they were without a bottle date. The cap seems to suggest it's from 2010, but it could also be the date that the beer won an World Beer Cup award. Thoughts?

The beer was great, btw. Aged beautifully, with just a hint of dark fruit that develops with age. Otherwise, smooth, with nice chocolate and cherry qualities. Still poured a reddish brown with a 1 cm caramel head. Very glad to have tried it.