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 Ladies Size White Dial 2 Tone Gold Plated Stainless Steel Strap Watch SYMA35K1
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Seiko 5 Classic Ladies Size Gold Dial 2 Tone Gold Plated Stainless Steel Strap Watch SYMD92K1
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Seiko 5 Classic Ladies Size White Dial 2 Tone Gold Plated Stainless Steel Strap Watch SYMK44K1
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Seiko 5 Classic Ladies Size Gold Dial Gold Plated Stainless Steel Strap Watch SYMA04K1
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Seiko 5 Classic Ladies Size Black Dial Gold Plated Stainless Steel Strap Watch SYMA06K1
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Seiko 5 Classic Ladies Size Gold Dial Gold Plated Stainless Steel Strap Watch SYMA38K1
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Seiko 5 Classic Ladies Size Gold Dial Gold Plated Stainless Steel Strap Watch SYMK20K1
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Seiko 5 Classic Ladies Size Black Dial Gold Plated Stainless Steel Strap Watch SYMA40K1
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Seiko 5 Classic Ladies Size Gold Dial Gold Plated Stainless Steel Strap Watch SYM600K1
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Seiko 5 Classic Ladies Size Black Dial Gold Plated Stainless Steel Strap Watch SYM602K1
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Seiko 5 Classic Ladies Size Black Dial Gold Plated Stainless Steel Strap Watch SYME48K1
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Seiko 5 Classic Ladies Size Black Dial Gold Plated Stainless Steel Strap Watch SYMD96K1
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Seiko 5 Classic Ladies Size White Dial Gold Plated Stainless Steel Strap Watch SYMA22K1
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Seiko 5 Classic Ladies Size Black Dial Gold Plated Stainless Steel Strap Watch SYMK38K1
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Seiko 5 Sports Blue 55 Fathoms Men's Watch SNZH53K1
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Seiko 5 Sports Japan Made Blue 55 Fathoms Men's Watch SNZH53J1
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