Brand Frederique Constant Caliber Number FC-391, FC391 In-House? No Base Caliber Manufacture la Joux-Perret LJP L110 Movement Type Automatic, self-winding mechanical, chronograph Diameter 30.4mm Height 7.9mm Jewel Count 26 jewels
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Manufacturer Elgin Grade Number 70 Railroad Grade? Yes Model 2 Size 18s Jewel Count 15/17 jewels Beat Rate / Frequency 18,000 bph / 2.5 Hz Case Style Hunter Winding Type
Manufacturer Sea-Gull Caliber Number ST2108 Base Caliber Seagull ST2130 Movement Type Automatic, self-winding mechanical Lignes 11.5”’ Diameter 26mm Jewel Count 21 jewels (see below) Beat Rate / Frequency 28,800 bph
Manufacturer Sea-Gull Caliber Number ST1961, ST-1961 Base Caliber Seagull ST1901 Movement Type Mechanical, manual-wind, split-second chronograph Diameter 31.3mm Height Unconfirmed Jewel Count 27 jewels Beat Rate / Frequency 21,600 bph
Manufacturer Patek Philippe Caliber Number 10-200 In-House? Yes Movement Type Mechanical, manual-wind Lignes 10”’ Diameter 22.5mm Height 3.65mm Jewel Count 18 jewels Beat Rate / Frequency 19,800 bph / 4
Manufacturer Miyota Caliber Number 3N20 Movement Type Quartz, battery-powered Lignes 5.5”’ x 6.75”’ Height 2.54mm Jewel Count 1 jewel Frequency 32,768 Hz Battery Cell # 364 Hand Count 2 Hand
Manufacturer Seiko Caliber Number 4R72, 4R72A In-House? Yes Movement Type Automatic, self-winding mechanical, skeletonized Diameter 27.4mm Casing Diameter 27mm Thickness 5.32mm Jewels 24 Beat Rate / Frequency 21,600 bph /
Brand Orient Star Caliber Number 40S62 Manufacturer Epson (Seiko Instruments Inc.) Movement Type Automatic, self-winding mechanical Jewel Count 24 Beat Rate / Frequency 21,600 vph / 3 Hz Lift Angle
Brand TAG Heuer Caliber Number TH31-02 In-House? No Manufacturer Sellita Manufacture AMT Movement Type Automatic, self-winding mechanical COSC? No Jewel Count 30 Beat Rate / Frequency 28,800 vph / 4
Brand Frederique Constant Caliber Number FC-220 In-House? No Base Caliber Ronda 515, Ronda 505, Ronda 1016 (see below…) Movement Type Quartz, battery-powered Jewel Count 1 or 8 Frequency 32,768 Hz
Manufacturer Sea-Gull Caliber Number ST1780, ST-1780, TY2714 Movement Type Automatic, self-winding mechanical Diameter Unconfirmed Height 6.26mm Jewel Count 28 jewels Beat Rate / Frequency 21,600 bph / 3 Hz Lift
Manufacturer Grand Seiko Caliber Number 9RB2, 9RB2A Movement Type Spring Drive, hybrid automatic Diameter 30mm Height 5.02mm Jewel Count 34 jewels Accuracy Rating +/- 20 seconds/year Power Reserve 72 hours
Manufacturer Rolex Year Introduced 2025 Calibers Rolex 7135 Known Materials Nickel phosphorus alloy, ceramic (balance staff) Known Models Rolex Land-Dweller (Ref: 127334) (Add your watch to the comments below…) The
Manufacturer Rolex Caliber Number 7135 Base Caliber Rolex 7140 In-House? Yes Movement Type Automatic, self-winding mechanical Chronometer Spec? Yes (Superlative Chronometer = COSC + Rolex certification) Jewel Count 39 jewels
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