This 3-pronged antishock device was found in this vintage Unitas caliber 431 watch movement. There were several similar 3-prong shock protection devices available during the span of time that this
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Brand Frederique Constant Caliber Number FC-310 In-House? No Base Caliber Sellita SW200-1 AJ Movement Type Automatic, self-winding mechanical Lignes 11.5”’ Diameter 25.6mm Height 4.6mm thick Jewels 26 Beat Rate /
Manufacturer Tianjin Sea-Gull Caliber Number TY-2871, TY2871 Base Family ST16 (based on Miyota 8 series) Movement Type Automatic, self-winding mechanical Lignes 11.5”’ Diameter 26mm Height 6.57mm Jewel Count 21 Beat
Manufacturer Seiko Caliber Number 4M21, 4M21A Movement Type Kinetic (AGS), quartz Lignes 11.5”’ Diameter 25.6mm Height 2.7mm Jewel Count 9 Frequency 32,768 Hz Accuracy Rating +/- 15 seconds/month Capacitor 30274MZ,
Manufacturer ETA Caliber Number F07.111, F07111 Status Phased-out, discontinued Type Quartz, battery-powered Thermo-Compensated? No Linges 13.25”’ Overall Diameter 30mm Height 2.5mm Height w/ Battery 2.62mm (371 battery) / 3.22mm (395
Manufacturer Miyota (Citizen) Caliber Number 6P23 Movement Type Quartz, battery-powered Lignes 10.5”’ Diameter 23.7mm Thickness 3.45mm Jewels 0 Frequency 32,768Hz Battery Cell Number SR621SW (364) Estimated Battery Life 3 years
Brand NOMOS Glashütte Caliber Number DUW 6101, DUW6101 Movement Type Automatic, Self-winding mechanical In-House? Yes Chronometer Spec? Yes COSC? No Linges 15.5”’ Diameter 35.2mm Height 3.6mm thick Jewels 27 Total
Brand Eterna Caliber Number 3501, EMC 3501 Movement Type Mechanical, manual-wind Shape Rectangular Lignes 10.75”’ x 13.25”’ Diameter 24mm x 30mm Height 4.1mm Jewel Count 18 Beat Rate / Frequency
Manufacturer Bulova Caliber Number NM50 Movement Type Quartz, battery-powered, Jewel Count 8 (unconfirmed) Frequency 262,144 Hz (262 kHz) Beats Per Second 16 Accuracy Rating +/- 5 seconds/month Battery Cell Number
Manufacturer Seiko Caliber Number 4T53, 4T53A Movement Type Quartz, battery-powered Display Analog Lignes 12.75”’ Diameter 29.5mm Height 4.6mm Jewel Count No jewels (0) Frequency 32,768 Hz Accuracy Rating <20 seconds/month
Manufacturer Bulova Caliber Number 2192, 2192.10 Movement Type Electronic, tuning fork Lignes 12.5”’ Diameter 28.75mm Height 6.1mm Jewel Count 8 Frequency 360 Hz per second Battery Cell 344 (see below)
Brand Omega Caliber Number 269 Movement Type Mechanical, manual-wind Total Diameter 30.5mm Casing Diameter 30mm Height 4mm Jewel Count 17 Beat Rate 18,000 bph Lift Angle 49 degrees Power Reserve
Manufacturer Master of Time SA Caliber Number DB9, DB-9 Base Caliber ETA 6497-2 Lignes 16.5”’ (36.6mm) Diameter 36.6mm Height 4.5mm thick Beat Rate / Frequency 21,600 bph / 3 Hz
Manufacturer S. Epson Corp. (Seiko Instruments Inc.) Caliber Number VX42, VX42E Seiko Number 7N42, 7N42C Movement Type Quartz, battery operated Display Type Analog Lignes 11.5”’ Diameter 25.6mm Height 2.62mm Jewels
Revue Thommen is a watch brand that produces a wide variety of wristwatch styles. It appears, at least at this time, that the brand only has automatic watches in their
Sources
network of watch sites
