Seiko 5 automatic watches

Seiko 5 automatic

Seiko 5 Sports watch is the cheapest and robust sports watch you can find with mechanical Movement Seiko 5 automatic watch was born 50 years ago.
The 5 in its logo stands for

automatic movement 
shock resistant 
watertight (30 meters minimum)
solid steel case 
date and weekday display 

Since then, the Seiko 5 had become the top selling automatic watch collection in the history of horology. The movements used were constantly modernised, and presently there were countless models and styles available. Nevertheless the price is not only affordable, but constantly held below the competition. The most popular and common Seiko 7S26 automatic movement mainly seen in SKX-series divers and Seiko 5 series. The series includes the 7S26, 7S36, and 7S25, which differ in an extra jewel and or missing day complication. Below are the different movement used in Seiko mechanical watches.
Mid 1996 7S26A
Late 2005 6R15A introduced, based on the 7S with Etachron regulator and Spron 510 mainspring Used in Seiko Sumo
Late 2006 7S26B introduced with Etachron regulator
Late 2006 6R15B introduced - new parts: Use in Seiko cocktail series
Mid 2008 4R15 and 4R16 introduced, based on 6R15 but minus manual winding and hacking
Mid 2011 4R36A introduced along with other variants (35, 36, 37, 38 & 39) Used in SRP series

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Seiko 5 automatic watches