The HM3 Frog X 10th Anniversary Edition was inspired by the transparent-skinned glass frogs of Central America with the case made entirely in sapphire crystal. With protruding eyes, the hour and minute domes can be seen in many directions and the highly polished crown hides a secret message; the MB&F battle-axe icon that can only be seen with just the right angle and lighting. This timepiece has a blue rotor and comes on a blue leather strap. Limited to 10 pieces.