Movements & Mechanics
How watch movements actually work and which calibre is inside the watch you are shopping for: Rolex, Omega, Tudor, Seiko and Grand Seiko calibres explained, compared and rated for ownership.
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Zenith El Primero Explained: Specs, Accuracy, Service and the References That Carry It
From its 1969 debut to the silicon-escaped Cal. 3600 inside the Chronomaster Sport today, the El Primero remains watchmaking’s defining high-frequency chronograph. Here is everything you need to know: specs, service intervals, pre-owned prices, and which reference fits which buyer.
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Tudor Manufacture Calibres Explained: MT5601, MT5602, MT5652 and the MT5400 — Which Movement Is in Your Watch?
When Tudor unveiled its first manufacture movement in 2015, the watch world took notice. For decades, Tudor had relied on supplied calibres — respected workhorses from ETA and Sellita — while the sibling brand upstairs at Rolex polished its own movements. The in-house push changed the conversation: Tudor was no longer just the value play…
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Grand Seiko Spring Drive Explained: How It Works, Accuracy, Service and Which Models to Buy
The Grand Seiko Spring Drive explained: how the Tri-synchro Regulator achieves quartz-level accuracy from a mainspring, the full calibre family compared, service costs, and which models to buy.
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Seiko 4R36 vs 6R35 vs 6R55: Which Movement Is in Your Seiko and Does It Matter?
A precise comparison of Seiko’s three mainstream automatic calibres — 4R36, 6R35, and 6R55 — with specs, accuracy, power reserve, service costs, and the models that carry each movement.
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Omega Co-Axial Calibre 8800 vs 8900 vs 3861: What Is Actually Inside Your Omega
The Co-Axial Master Chronometer calibres inside your Omega explained: how the 8800, 8900, and 3861 differ in specs, power reserve, complications, service cost, and which watch each powers.
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Rolex Calibre 3235 Explained: Specs, Accuracy, Service and Which Models Have It
The Rolex Calibre 3235 is the movement inside almost every sport and date Rolex on sale today — including the Submariner Date, Datejust, Sea-Dweller, Deepsea, and Yacht-Master. Introduced in 2015 to replace the Calibre 3135, it brings three meaningful upgrades: a 70-hour power reserve (up from 48), a Chronergy escapement that is 15% more energy-efficient…