Manufacturer ETA Caliber Number 2851 Base Caliber ETA 2850 Family ETA 2800 series “Gabarit” Movement Type Mechanical, manual-wind Lignes 11.5”’ Diameter 25.6mm Height 4.3mm Jewel Count Varies Beat Rate 21,600
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Manufacturer ETA Caliber Number F06.412, F06412 Type Quartz, battery-powered COSC? Possible, depends on watch Thermo-Compensated? Yes Linges 11.5”’ Overall Diameter 25.6mm Casing Diameter 26.20 Height 2.62mm (with 371 battery) or
Brand Raymond Weil Caliber Number RW4251, RW 4251 In-House? No Base Caliber Sellita SW260-1 or SW261-1 (see below) Movement Type Automatic, self-winding mechanical Lignes 11.5”’ Diameter 25.6mm Height 4.6mm or
Brand Orient Caliber Number F6B22 In-House? Yes (Seiko Epson) Movement Type Automatic, self-winding mechanical Jewels 22 Beat Rate 21,600 vph, 3 Hz Lift Angle (Add to comments below…) Power Reserve
Manufacturer ETA Caliber Number 2850 Movement Type Mechanical, manual-wind Lignes 11.5”’ Diameter 25.6mm Height 4.3mm Jewel Count Varies Beat Rate 28,800 vph, 4 Hz Lift Angle 52 degrees Power Reserve
Manufacturer Miyota Caliber Number 0S11 Movement Type Quartz, battery-powered Style Vertical bi-compax chronograph (12-6) Lignes 13.5”’ Diameter 30.8mm Height 4.13mm thickness Jewels 0 (no jewels) Frequency 32,768Hz Accuracy Rating +/-
Manufacturer Seiko Caliber Number 6532A Movement Type Quartz, battery-powered Lignes 10.5”’ Diameter 24mm Casing Diameter 23.3mm Height 2.7mm Jewel Count 5 Frequency 32,768 Hz Accuracy Rating Less than 15 seconds/month
Brand Oris Caliber Number 641 In-House? No Base Caliber ETA 2836-2 Movement Type Automatic, self-winding mechanical Chronometer? Yes COSC? Yes Lignes 11.5”’ Diameter 26mm Casing Diameter 25.6mm Height 5.05mm (unconfirmed)
Manufacturer Seiko Caliber Number 6810 In-House? Yes Base Caliber Seiko 68A Similar Calibers Credor 6810, 6810A Movement Type Mechanical, manual-wind Shape Tonneau Diameter 19.7mm x 16.9mm Height 1.98mm Jewel Count
Brand Oris Caliber Number 645 In-House? No Base Caliber ETA 2836-2 Movement Type Automatic, self-winding mechanical Lignes 11.5”’ Diameter 26mm Casing Diameter 25.6mm Height 4.6mm (unconfirmed) Jewel Count 27 Beat
Brand Oris Caliber Number 644 In-House? No Base Caliber ETA 2836-2 Movement Type Automatic, self-winding mechanical Lignes 11.5”’ Diameter 26mm Casing Diameter 25.6mm Height 5.05mm (unconfirmed) Jewel Count 27 Beat
Manufacturer Miyota (Citizen) Caliber Number 0S80 (sometimes incorrectly typed as OS80) Type Quartz Replaces Caliber Unknown, please add in the comments below Lignes 13.5”’ Diameter 30.8mm Height 4.68mm Jewels 0
Manufacturer PTS Resources Limited Caliber Number DG-2813, DG2813 Based On Miyota 8215 Movement Type Automatic, self-winding mechanical Diameter 26mm Height 5.4mm thick Jewels 22 Beat Rate 21,600 bph Lift Angle
Manufacturer PTS Resources Limited Caliber Number G3265ZH, G3265Z, G3265, 3265 Type Automatic, self-winding mechanical Diameter 32.8mm Height 5.87mm thick Jewels 20 Vibrations Per Hour 21,600 bph Lift Angle Unconfirmed Hand
Brand Longines Caliber Number L687 In-House? No Base Caliber ETA A08.L91 (ETA/Valjoux 7751) Movement Type Automatic, self-winding mechanical Lignes 13.25”’ Diameter 30mm Height 7.9mm Jewel Count 25 Beat Rate 28,800
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