SEIKO 5 Sports Automatic Watch for Men

Featuring a Black / Blue Band, Silver-tone Case, and Scratch Resistant Hardlex Crystal, this Stainless Steel Case with Black Nylon Strap watch boasts a Day/Date Display with Arabic Option, Luminous Hands and Markers, and Hardlex Mineral Crystal for Durability. The item width is 4.7 inches, and the clasp type is Buckle.

Introduced in the 1970s, the SEIKO 5 is characterized by five essential attributes: 1) Automatic, 2) Water resistant, 3) Shock resistant, 4) Date, and 5) Day. It's worth noting that some SEIKO 5 models are in fact SEIKO 4 models, as they lack the "Day" function, and instead use the Caliber 7S25 movement. Re-issues of SEIKO 5 Sports often utilize the 7S36 caliber, which features 23 Jewels, as opposed to the 21 Jewels found in the more common 7S26 movement.

All of these movements, including the ETA 2824-2 and the Miyota 82xx, share a common trait: they beat at a rate of 21,600 bph (beats per hour) or 6 bps (beats per second). In contrast, the ETA 2824-2 beats at 28,800 bph or 8 bps, while the Miyota 82xx beats at 21,600 bph.

The prevalence of these inexpensive automatic movements, particularly those from China, has challenged the market share of the more established brands in recent years (as of 2006). An automatic watch, or self-winding watch, is a mechanical timepiece that derives its power from the motion of the wearer's arm, rather than requiring manual winding. This is in contrast to quartz watches, which are powered by electricity.

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