Made in Turkey from visibly impressive-looking Italian leather, Sena's new lineup of iPhone 4 cases is largely comprised of sequels to prior-generation versions. Shown first in our photos is the basic playthrough case Sarach Leatherskin ($60), which has distinctive contrasting side stitching and an open face with no belt clip attachment. A step up in complexity is Walletslim ($45), which grafts two credit card-sized compartments to a frame that's…