You're correct the 2012 model was when they stopped offering the Anti-glare screen - it was 1680x1050(if i recall?) compared to the default glossy screen's 1440x900, i recall there also being a 1680x1050 glossy display upgrade available too, at a glance the two could be distinguished by the aluminium bezel on the anti-glare display.

I picked up a grey market anti-glare display assembly (upper clamshell) for my 2011 model back in 2012 or so and it dutifully served another few years.