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 100M Field Sports Style Black Dial Automatic Nato Strap Watch SRPJ85K1
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Seiko 5 Sports LE 100M COIN PARKING DELIVERY Men's 2 Tone Gold Plated Watch SRPK02K1
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Seiko 5 100M Field Sports Style Black Dial Automatic Watch SRPJ81K1
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Seiko 5 100M GMT Style Blue Dial Automatic Watch SSK003K1
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Seiko 5 100M GMT Style Black Dial Automatic Watch SSK001K1
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Seiko 5 100M GMT Style Orange Dial Automatic Watch SSK005K1
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Seiko 5 100M X UltraSeven Double Anniversary Limited Edition Automatic Watch SRPJ79K1
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Seiko 5 Sports Military 100M Automatic Men's Watch Green Nylon Strap SRP621K1
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Seiko 5 100M X Honda Super Cub Limited Edition Automatic Watch SRPJ49K1
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Seiko 5 100M Skeleton Style Brown Dial Automatic Watch SRPJ47K1
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Seiko 5 100M X Kosuke Kawamura Limited Edition Automatic Watch SRPJ41K1
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Seiko 5 Sports 100M Automatic Men's Watch Green Camo Dial SRPJ37K1
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Seiko 5 Sports 100M LE Yuto Horigome Automatic Men's Watch Black Camo Dial SRPJ39K1
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Seiko 5 Sports 100M One Piece x Trafalgar Law LE Automatic Men's Watch White Dial Rubber SRPH63K1
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Seiko 5 Sports 100M One Piece x Zoro LE Automatic Men's Watch Green Dial Rubber SRPH67K1
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Seiko 5 Sports 100M One Piece x Sanji LE Automatic Men's Watch Grey Dial Rubber SRPH69K1
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