I just bought a new suitcase online.

The Rimowa Titanium 73. The seller says that its a 2012 version with the article number being 945.73.
But I was reading through the newest 12/13 catalogue of Rimowa and the article number is 920.73.
So is it the newest version?

Apperently there are two different version of the Titanium 73, because the ones that are sold in Taiwan (where Im from) have this plastic corner on the top right corner. And the one sold in Germany (where I study now and bought this) are the same on both top corners.

Could somebody help me?
Thanks in advance.

P.S. Do the airlines actually care if the luggage exceeds 158 cm? I usually my between Asia and Europe and occasionally going on Vacation in the US.