Zenith El Primero Grande Class XXT ref. 03.0520.4100/22.C492, with box

The Zenith Grande Class reference 03.0520.4100/22.C492 is a substantial 44mm stainless steel chronograph that brings together an impressive suite of complications (chronograph, triple calendar, and moonphase) arranged legibly across a cluster of subdials and apertures. The black dial features a stamped hobnail guilloche pattern at its center, framed by applied Arabic and dagger indices that lend a subtle vintage character to the overall presentation. Visible through the exhibition caseback is the Zenith El Primero caliber 4100, an in-house movement that stands as a cornerstone of the brand's horological legacy. Its high-frequency 36,000 vibrations per hour beat rate — a defining characteristic of El Primero movements — produces a beautifully fluid sweep of the seconds hand that is immediately noticeable on the wrist.

This watch is in fair to good overall condition, showing noticeable signs of regular wear including scratches, scuffs, and dents. Considerable scuffing is present on the bezel around the 4 and 5 o'clock areas. On close inspection, some very light marks are visible on the crystal, as well as a tiny speck above the right subdial. The movement is running properly with all functions operating as intended, though its service history is unknown. Additional photos and timegrapher results are available on request.

This watch does not come with its original box or papers.

Brand: Zenith

Model: Grande Class XXT

Reference: 03.0520.4100/22.C492

Year: 2000s (approximation)

Case size: 44mm

Lug-to-lug: 51mm

Case thickness: 14.3mm

Case material: Stainless steel

Dial color: Black

Movement: Zenith El Primero caliber 4100

Complications: Chronograph, date, day, month, and moonphase

Water resistance: 50 meters

Strap/bracelet: Zenith black alligator leather strap with stainless steel butterfly clasp

Lug width: 22mm