Zenith Sub-Sea Chronograph Ref. A277 "Reversed Panda Dial"Zenith has a rich history in chronograph production, with its most famous milestone being the launch of the El Primero in 1969one of the first automatic chronograph movements. However, the brands legacy extends beyond that, with exceptional chronographs predating the El Primero, including the Zenith A277 we have on offer today. This example has aged beautifully, featuring a strong 40mm steel case with pump style chronograph pushers. The rotating bezel