It is the AV 6-18X50, which is from the same series as the scopes Swarovski currently refer to as the "Z3", though they have discontinued that particular model. A buddy of mine has that scope, and it's a fantastic, as you'd expect from Swaro. When it was available, it retailed for around $1200 - $1400, so it's a high end scope by 1" tube standards. The reason they discontinued it is because they simplified the Z3 line (3:1 zoom ratio) once they introduced the Z5 series (5:1 zoom ratio) scopes. They trimmed the Z3 line down to only 3 models. Today, high zoom ratios (over 4:1) are the rage, and since they introduced the Z5 3.5-18X44 at a MSRP not much more than the AV 6-18X50, yet offering much greater FOV on the low end of the power range, it didn't make much sense to continue building the 6-18X50.
Enjoy your scope. It's a good one!