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 Seiko 5 watch boasts a Day/Date Display with Arabic Option, Luminous Hands and Markers, and Hardlex Mineral Crystal for Durability. The item width measures 4.7 inches, and the clasp type is a Buckle.

The "5" in Seiko 5 has a significant meaning, as a great marketer had the idea in the 1970s that a Seiko 5 watch must have five key attributes: 1. Automatic, 2. Water resistant, 3. Shock resistant, 4. Date, and 5. Day. However, some Seiko 5 models are actually Seiko 4, as the "Day" function may be omitted, in which case the Caliber 7S25 is used instead of the more common 7S26.

Reissues of Seiko 5 Sports often utilize the 7S36 caliber, which is similar to the 7S26 but features 23 Jewels instead of 21. It's worth noting that all these movements, including the ETA 2824-2 and Miyota 82xx, beat at a rate of 21,600 bph (beats per hour) or 6 bps (beats per second), as opposed to the ETA 2824-2's 28,800 bph or 8 bps.

The reason these three movements are mentioned is that they are found in approximately 80% of all inexpensive automatic wristwatches, a significant market share that is currently being challenged by the increasing presence of inexpensive China-made automatic movements.

An automatic watch, also known as a self-winding watch, is a mechanical timepiece that is powered by the motion of the wearer's arm, eliminating the need for manual winding. This is in contrast to a quartz watch, which is powered by electricity rather than a mainspring.

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