SEIKO 5 Sports Automatic Watch for Men

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

The "SEIKO 5" name originated from the idea that a SEIKO 5 watch must have 5 key attributes: 1) Automatic, 2) Water resistant, 3) Shock resistant, 4) Date, and 5) Day. However, some SEIKO 5 models are in fact SEIKO 4 models, as they omit the Day function and use the Caliber 7S25 movement instead of the more common 7S26. Reissues of SEIKO 5 Sports often utilize the 7S36 caliber, which is similar to the 7S26 but has 23 jewels instead of 21.

It's important to note that all these SEIKO movements, including the 7S26, 7S25, and 7S36, beat at a rate of 21,600 bph (beats per hour) or 6 bps (beats per second). In comparison, an ETA 2824-2 movement beats at 28,800 bph or 8 bps, while a Miyota 82xx movement beats at 21,600 bph. These three movements (ETA 2824-2, Miyota 82xx, and the SEIKO 7S series) are found in approximately 80% of all inexpensive automatic wristwatches, though this market share is being challenged by the increasing prevalence of inexpensive automatic movements from China.

An automatic watch, also known as a self-winding watch, is a mechanical timepiece with a balance wheel escapement. Unlike a quartz watch, which is powered by electricity, an automatic watch is powered by a mainspring that is wound by the motion of the wearer's arm, eliminating the need for manual winding every day.

In summary, this SEIKO 5 watch embodies the brand's commitment to quality, durability, and innovation, with features like an automatic movement, water resistance, shock resistance, date and day display, and scratch-resistant crystal. The precise and reliable timekeeping characteristics of the SEIKO 5 line have made it a popular choice among watch enthusiasts and casual wearers alike.

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