TX watches introduced the TX 310 Classic Retrograde Perpetual Calendar during Baselworld 2010. This all new timepiece features a round 44.5 mm stainless steel "classic" style case and a domed crystal. (Note: the K1 hardened mineral crystal has a high potential to scratched, as opposed to a sapphire which is virtually scratch proof. One of the sample pieces at the show already had a scratch on the crystal.) Even so, this is a really nice timepiece, especially considering its price. The case and dial are more classic than most of the watches in the TX collection, and I think this is a good thing. It offers something different. The look is very simple, and the dial is easy to read.