Built around the Q1288420 reference, this JLC Master Ultra Thin replica delivers a silver sunray interpretation of the Date model that emphasizes readability and clean proportions. The 39mm stainless steel case maintains the slim profile that defines the Ultra Thin sub-family, while the silver-tone dial adds a neutral base that pairs with virtually any strap color. Applied indices in a polished finish catch ambient light without overwhelming the dial surface. The genuine Jaeger-LeCoultre Master Ultra Thin Date, reference Q1288420, sits at the intersection of dress watch and daily wearer, and this version preserves that dual-purpose character.

Case & Movement Specs

• Case diameter: 39mm
• Case material: stainless steel
• Reference: Q1288420
• Dial: silver with applied hour markers
• Crystal: sapphire with anti-reflective coating
• Hands: dauphine, polished
• Movement: clone Cal. 899, automatic, 28,800 vph
• Power reserve: 36 hours (genuine Cal. 899: 38 hours)
• Water resistance: 50 m (same as genuine)
• Functions: hours, minutes, seconds, date

Q1288420 is the model reference, not a caliber number: the genuine Master Ultra Thin Date runs the automatic Cal. 899, and this version is built on a clone of that caliber beating at 28,800 vph. The automatic winding system keeps the case depth minimal while delivering consistent timekeeping.

Caliber Breakdown

The clone Cal. 899 drives three central hands plus a date window positioned at six o’clock, and the dial carries the AUTOMATIQUE line that marks the self-winding models. The silver dial shows the seconds hand sweep more clearly than darker versions because of the contrast between the polished steel hand and the lighter background. This makes the Q1288420 one of the easier Ultra Thin references to read at a glance. Set it next to the black-dial 1548171 and the visual gap is significant: same 39mm case, entirely different wrist presence. Both are listed under Master Control on this site, though the Q1288420 itself comes from the Master Ultra Thin line, and the two serve opposite ends of the formality spectrum.

How It Compares

Silver dials occupy the most versatile position in any collection. They read dressy enough for formal settings yet neutral enough for everyday use. The Q1288420 does not compete with white for brightness or black for drama, and that middle position is exactly its strength. This Master Ultra Thin super clone works as the single dress watch in a rotation or as the quiet counterpoint to something bolder on the other end of your case.

Steel and silver is the entry point to this line, and the Master Ultra Thin Date listings put the Q1288420 next to the rose gold Q1282510. There is a case for starting exactly here, and it is set out in which Master Ultra Thin is the safest first JLC.

Specifications

• Model: Jaeger-LeCoultre Master Ultra Thin Date
• Reference: Q1288420
• Case: stainless steel
• Case size: 39 mm
• Dial: silver sunray with applied steel baton markers
• Complications: date window at 6 o’clock, central seconds
• Movement: clone Cal. 899, automatic, 28,800 vph
• Power reserve: 36 hours (genuine Cal. 899: 38 hours)
• Water resistance: 50 m (same as genuine)
• Crystal: sapphire
• Strap: black alligator with pin buckle