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 Gold+White Dial Couple's 2 tone Gold Plated Stainless Steel Watch Set SNK365K1+SYMA35K1
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Seiko 5 Classic White Dial Couple's 2 tone Gold Plated Stainless Steel Watch Set SNKL47K1+SYME44K1
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Seiko 5 Classic White Dial Couple's 2 tone Gold Plated Stainless Steel Watch Set SNKL24K1+SYMK44K1
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Seiko 5 Classic White Dial Couple's 2 tone Gold Plated Stainless Steel Watch Set SNK363K1+SYMA35K1
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Seiko 5 Classic Blue+White Dial Couple's Stainless Steel Watch Set SNK793K1+SYMD87K1
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Seiko 5 Classic Blue Dial Couple's Stainless Steel Watch Set SNK793K1+SYMD93K1
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Seiko 5 Classic Black Dial Couple's Stainless Steel Watch Set SNKL71K1+SYMK43K1
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Seiko 5 Classic Black Dial with Red Bar Couple's Stainless Steel Watch Set SNKK31K1+SYMD95K1
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Seiko 5 Classic White Dial with Red Bar Couple's Stainless Steel Watch Set SNKK25K1+SYME39K1
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Seiko 5 Classic White Dial with Red Bar Couple's Stainless Steel Watch Set SNK369K1+SYMA41K1
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Seiko 5 Sports 100M Automatic Men's Watch Black Dial Bezel SRPD55K1
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Seiko 5 Sports Black Dial Mini Baby Monster Men's Stainless Strap Watch SRPB35K1
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Seiko 5 Classic Ladies Size Silver Dial 2 Tone Gold Plated Stainless Steel Strap Watch SYMK29K1
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Seiko 5 Sports 100M 24 Hour Sub-Dial Black Men's Stainless Steel Strap Watch SSA065K1
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Seiko 5 Sports 100M 24 Hour Sub-Dial Red Men's Stainless Steel Strap Watch SSA069K1
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Seiko 5 Classic Men's Size Black Dial Stainless Steel Strap Watch SNKL71K1
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