1988–2000

Case: 40 mm steel, sapphire crystal, screw‑down pushers & crown

Movement: Zenith El Primero base (Rolex Cal. 4030), automatic, 28,800 vph

Bezel: Engraved stainless steel tachymeter up to 400 units/h

Dial: Black or white; includes rare “Patrizzi” dials (patinated subdial rings), sigma vs pre‑sigma markings