Rolex Lady-Datejust 28 vs Rolex Datejust

Side-by-side at a glance. Click a watch above to open the full reference page.

	Rolex 279174	Rolex 16234
Model	Lady-Datejust 28	Datejust
Caliber	Rolex Cal. 2236 -- in-house automatic, 28,800bph, 55h PR, 31j; silicon Syloxi hairspring; used in Lady-Datejust 28; Rolex first silicon hairspring caliber	Rolex Cal. 3135 -- in-house automatic, 28,800bph, 48h PR, 31j; Parachrom hairspring, Glucydur balance; long-running COSC-certified movement
Case size	28mm	36mm
Lug-to-lug	37mm	44mm
Years produced	2015–present	1988–2006
Brand tier	luxury	luxury
Era	modern	vintage
Movement tier	In-house manufacture	In-house manufacture
Market median (excellent / full-set)	n/a	n/a
Typical range	n/a	n/a
Confidence	low	low
Categories	dress	dress
Editorial	yes	yes
Typical price (2026)	n/a	$3,500 – $5,500
Service	n/a	Every 10 years · $900 – $1,400
Collector note	n/a	best value: The 36mm two-tone Datejust 16234 offers the core Rolex package in a case that wears more cleanly than current Rolesor production; prices remain below $5,000 for clean examples.