Mondaine Watch SBB Simply Elegant A638.30350.11SBG. Official Swiss Railways Watch. The new Mondaine Simply Elegant seasonal special is simply perfect. The purity of its elegant design has been cleverly enhanced by a super flat case giving this new model an almost futurist feel. A totally different style is offered by the 41mm model which is finished with a vintage brown leather strap for that worn in look. Fitting comfortably close on the wrist, this super flat collection is finished with the Mondaine standard sapphire crystal glass and familiar face.