Mine is serial number 134-363XX, which should have been late 2011. It was a cataloged configuration (as opposed to a special limited run), therefore, it is doubtful anyone can give an exact quantity. I will say it is super accurate. Have shot one hole groups with Hornady 140 grain AMAX. Interesting article in Long Range Hunting testing the No. 1 and M77, both in 6.5 Creedmoor. Hope it is allowable to post a link here.
http://www.longrangehunting.com/articles/ruger-6.5-creedmoor-review-1.php