Expedition Field Post Solar 36mm Eco-Friendly Leather Strap WatchPowered by any light source Take what you love about the Field Post 41 Solar, and scale it all down to a slightly retro profile that harkens back to military issue watches from decades past. At 36mm diameter, the Field Post 36 Solar is the perfect size for lovers of vintage watch design and anybody with a smaller wrist. Like its bigger brother, this watch provides a reliable solar movement with up to a 4 month power reserve, anti reflective sapphire