this open shank ring features three crystals
6 mm stainless steel ovoid case that holds a mother-of-pearl dial under a scratch-resistant sapphire crystal
5 mm multi-piece stainless steel case that holds a gradient sunray green dial under a double-domed sapphire crystal and bordered by an 18K yellow gold uni-directional rotating coin edge bezel with a green ceramic top ring
The calendar of the watch is located at the 6 o'clock position and it is water-resistant up to 50 meters / 165 feet
Rado True Automatic Open Heart Ceramic Grey Dial Mens Watch Model# R27100112 features a 40 mm High-Tech Ceramic case that holds the grey open heart skeleton dial with silver-tone luminous hour markers and hands
Montblanc Star Legacy Orbis Terrarum Worldtimer Automatic Stainless Steel Gray Dial Gray Leather Strap Mens Watch 128675 metallic this open shank ring featuresMontblanc Star Legacy Orbis Terrarum Worldtimer Automatic Stainless Steel Gray Dial Gray Leather Strap Mens Watch Model# 128675 MB128675 With its roots firmly planted in the Legacy of Minerva, Montblanc's Star Legacy line combines the same classic design code with some of the highest technologies of today. This Star Legacy Orbis Terrarum, which is Latin for "globe", "earth", and "world", features a 43 mm stainless steel case with a multi layer dial