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A Seiko 5 showcasing attributes of the sub brand, including a recessed crown at the 4 o'clock position and day-date complication. Seiko 5 is a sub brand that spawned with the introduction of the Seiko Sportsmatic 5 in 1963. Since then, many models have been introduced into the lineup, comprising a variety of different styles.
ETA Mechanical movements Caliber Product Line Winding Diameter () Height () Jewels Frequency Running time () VPH Hz; 2671 [1]: Mecaline automatic 17.2 4.8 25
'Seiko Quartz Automatic Generating System' (A.G.S. = early Kinetic), Perpetuum Nobile (produced in 1989), Cal. 7M45, No. 246 of 700 Seiko AGS SCUBA Diver 200m 5M23-6A60, 1993 Automatic quartz is a collective term describing watch movements that combine a self-winding rotor mechanism [ 1 ] (as used in automatic mechanical watches ) to generate ...
The movement is an automatic winding, 25-jewel movement that can be fitted with a variety of features including the triple date (day, date, month and moon phase) or a variety of two and three register models with totalizers or counters for minutes, seconds and hours. It is available in three executions or grades: Elaborated, Top and Chronometer.
A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole. The hole is typically shaped like a torus and is slightly larger than the shaft diameter. The jewels are typically made from the mineral corundum, usually either synthetic sapphire or synthetic ruby. Jewel bearings are used in precision instruments ...
Jewel bearing of a balance wheel, supported by a lyre-shaped spring. The Incabloc shock protection system is the trade name for a spring-loaded mounting system for the jewel bearings that support the balance wheel in a mechanical watch, to protect the wheel's delicate pivots from damage in the event of physical shock, such as if the watch is dropped.