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 100M One Piece x Sabo LE Automatic Men's Watch Blue Dial Rubber SRPH71K1
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NEW Seiko 5 Sports 100M Automatic Men's Watch Grey Cement Nylon Strap SRPG63K1
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Seiko 5 Sports 100M Automatic Men's Watch Cement Grey Nylon Strap SRPG61K1
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Seiko 5 100M X Evisen Skateboards Limited Edition Automatic Brown Leather Strap Watch SRPF93K1
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Seiko 5 100M X Automoai Limited Edition Automatic White Leather Strap Watch SRPG43K1
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Seiko 5 Sports 100M Naruto LE Sasuke Uchiha Automatic Men's Watch Blue Dial Nylon Strap SRPF69K1
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Seiko 5 Sports 100M Naruto LE Rock Lee Automatic Men's Watch Green Dial Nylon Strap SRPF73K1
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Seiko 5 Sports 100M Naruto LE Shikamaru Automatic Men's Watch Grey Dial Nylon Strap SRPF75K1
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Seiko 5 Sports 100M LE Boruto's Sarada Automatic Men's Watch Red Dial Nylon Strap SRPF67K1
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Seiko 5 Sports 100M Automatic Men's Watch Black Nylon Strap SRPE67K1
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Seiko 5 Sports 100M Automatic Men's Watch Military All Green Nylon Strap SRPE65K1
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Seiko 5 Sports 100M Automatic Men's Watch Black Dial 2 Tone Rose Gold Plated SRPE58K1
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Seiko 5 Sports 100M Automatic Men's Watch Blue Dial SRPE53K1
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Seiko 5 Sports 100M Automatic Men's Watch Black Dial Gold Accents SRPE57K1
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Seiko 5 Sports 100M Automatic Men's Watch Black Dial SRPE55K1
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NEW Seiko 5 Sports 100M Automatic Men's Watch Stealth All BLACK Nylon Strap SRPE69K1
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