It has distinctive tri-color subsidiary dials, including a running seconds indicator at 9 o'clock, a 12-hour chronograph register at 6 o'clock, and there is a 30-miute totalizer at the three o'clock position. There is a perimeter tachymeter to 500 UPH, and inside on a plain black reserve is a 1/10th second ring.

A quick set date aperture window is 4 and 5 o'clock. The original silver dial has applied steel faceted luminous baton indexes, skeletonized white baton hands with luminous inserts, and a red center chronograph hand with a rectangular luminous indicator around a minute/one-fifth second scale. The 37mm diameter solid two-body case, hooded lugs, and flat bezel are polished.

There is a solid screw-down case back and round chronograph pushbuttons. It has the original integral stainless steel Gay Freres 'ladder' bracelet with a deployment clasp, and a scratch resistant domed sapphire crystal. 1969 stainless steel Zenith El Primero Chronograph A386. More about Vintage El Primero Tri-Color RARE SS / SS

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