The JM-N102-109 Nautical Chronograph Watch is inspired by nautical instruments. This open dial features Super Luminova markings for easy reading during the day or night. The 42mm case keeps the watch at a classic size for a comfortable everyday wear timepiece. At 10 ATM, the watch can be worn comfortably in everyday situations where there is water exposure. Each dial is hit with a subtle red, white, and blue marking on the second hand, which signify the colors and match the colors of the American Flag.Jack Mason