When it was introduced in 1963, the Seiko Sportsmatic 5 heralded multiple innovations. The first was the Diaflex mainspring, Seiko’s unbreakable mainspring. Another was the Diashock shock-resistant design, Seiko’s answer to the Swiss Incabloc system. Yet another was overall water resistance — although in those days the words “water proof” were used (a labeling that would have the Federal Trade Commission scrambling their lawyers if it occurred today). In any case, this third attribute was less a technological innovation and more an innovative design criteria for the Seiko 5 sub-brand.So what does the “5” mean anyway? There is some disagreement. Tradition (and many an online watch forum entry) says it’s for the following five key attributes of all Seiko 5 watches:
1. The Diaflex mainspring
2. The Diashock system
3. Automatic winding
4. Day/date indication
5. Water resistance
(Some sources combine Diaflex and Diashock while separating Day and Date.)
However, Seiko’s website commemorating the 50th Anniversary states a slightly different, somewhat more general set of attributes:
1. Automatic winding
2. Day/date displayed in a single window
3. Water resistance
4. Recessed crown at the 4 o’clock position
5. Durable case and bracelet
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Seiko 5 Sports Black 55 Fathoms Men's Watch SNZH55K1
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Seiko 5 Sports 100M Automatic Men's Stainless Mesh Strap Watch Green Bezel Dial SRPD75K1
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Seiko 5 Sports 100M Automatic Men's Leather Strap Watch Black Bezel Dial Rose Gold Plated Case SRPD76K1
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Seiko 5 Sports 100M Automatic Men's Watch Black Bezel Dial Green Nylon Strap SRPD65K4
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Seiko 5 Sports 100M Automatic Men's Watch Black Bezel Dial Nylon Strap SRPD55K3
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Seiko 5 Sports 100M Automatic Men's Watch Blue Bezel Dial Nylon Strap SRPD51K2
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Seiko 5 Sports 100M Automatic Men's Watch FORREST Green Bezel Dial SRPD63K1
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Seiko 5 Sports 100M Automatic Men's Watch Orange Dial SRPD59K1
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Seiko 5 Sports 100M Automatic Men's Watch Gold Black Bezel SRPD57K1
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Seiko 5 Sports Pro Diver's Men's Black Dial Stainless Strap Watch SKZ261K1
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Seiko 5 Sports Pro Diver's Black Dial Orange and White Two Tone Watch SKZ265K1
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Seiko 5 Sports Military 100M Camo Blue Dial Automatic Men's Watch SRP223K1
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Seiko 5 Sports Military 100M Automatic Men's Watch Black Nylon Strap SRP219K1
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