I do not know the year it was built. I just called Zeiss USA customer support and I was told this model was built b/w 2011-2016. (One can tell b/c it has the single knob adjustment).
That is an awesome deal on a premier spotter no matter how old it is. I had the previous version and I only gained a tiny, tiny bit with my ATX. Anyone looking to buy a new Vortex or similar would be WAY ahead buying this.