I am pretty sure this Omega Genève is 34mm and not 35 , but it has a large dial for ils size... i am pretty sure there is corosion on the back of the case . I like this model , I own one like this , but when it comes to manual wind, I much prefer , a 30 mm (30t2, 265, 266 ...) , the 600 family are more modern more clinical than the 30mm, but a but les Charming, and you can find bigger cases with the 30mm , ( 36, 37, 38mm) ...