Only way for sure is to follow Eldequellos advice on the serial number. I had a mid 80' s VArixIII and one I purchased 10 years later....the earlier model had a bump in the power selector which let you know roughly what power the scope was set at. I sent it back to Leupold and had it changed to the new version with no bump. Besides the addition of click adjustmnets on the VXII the lenses are also multicoated on the outside surfaces.