The Solar Black is designed after the 1A Black Automatic with its classic Mint Green Swiss Lume markers and hands. 20 ATM water resistance, 40mm PVD Black 316L Steel case with engraved back, Japan Lume on Bezel and anti-glare coated sapphire crystal with the classic tropic FKM strap. As the name implies the watch is powered by the sturdy and reliable Miyota 2070 Solar quartz movement used in the Sheffield GT model range.