ZENITH REF. 01-0010 420
PRIME CHRONOGRAPH AUTOMATIC STEEL
Zenith, "El Primero," Ref. 01-0010 420. Made in the 1990's.
Fine, water-resistant, stainless steel, water-resistant
wristwatch with date, oval button chronograph, registers,
tachometer
Three-body, polished and brushed, concave lugs, stepped
inclined bezel, transparent screw-down case back, sapphire
crystals.
Black with luminous Arabic numerals, outer 1/5th
seconds track and tachometer scale to 400 UPH, subsidiary
dials for the seconds, the 12-hour and 30-minute registers,
aperture for the date between 4 & 5. Luminous steel epee
hands.
Cal. 420, rhodium-plated, 25 jewels, straight-line
lever escapement, monometallic balance, shock absorber,
self-compensating flat balance spring, micrometer regulator.