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 Classic Men's Size Blue Dial Stainless Steel Strap Watch SNKK27K1
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Seiko 5 Classic Men's Size Blue Dial Stainless Steel Strap Watch SNK793K1
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Seiko 5 Classic Men's Size Silver Dial Stainless Steel Strap Watch SNK601K1
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Seiko 5 Sports Black Dial Mini Baby Monster Men's Stainless Strap Watch SRPB33K1
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Seiko 5 Classic Men's Size Silver Dial Stainless Steel Strap Watch SNKL51K1
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Seiko 5 Classic Men's Size White Dial Stainless Steel Strap Watch SNK369K1
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Seiko 5 Classic Men's Size Silver Dial 2 Tone Gold Plated Stainless Steel Strap Watch SNKL57K1
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Seiko 5 Classic Men's Size White Dial 2 Tone Gold Plated Stainless Steel Strap Watch SNK363K1
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Seiko 5 Classic Men's Size Silver Dial 2 Tone Gold Plated Stainless Steel Strap Watch SNKL24K1
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Seiko 5 Classic Men's Size Gold Dial 2 Tone Gold Plated Stainless Steel Strap Watch SNK365K1
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Seiko 5 Classic Men's Size Gold Dial 2 Tone Gold Plated Stainless Steel Strap Watch SNK792K1
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Seiko 5 Classic Men's Size White Dial 2 Tone Gold Plated Stainless Steel Strap Watch SNKL47K1
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Seiko 5 Classic Men's Size Gold Dial & Plated Stainless Steel Strap Watch SNKK98K1
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Seiko 5 Classic Men's Size Gold Dial & Plated Stainless Steel Strap Watch SNKL28K1
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Seiko 5 Classic Men's Size White Dial Gold Plated Stainless Steel Strap Watch SNKL26K1
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Seiko 5 Classic Men's Size Gold Dial & Plated Stainless Steel Strap Watch SNKK76K1
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