SEIKO 5 – “5” was the idea of a great marketer in the 70s: To be a SEIKO 5, a watch must have the following 5 (five) attributes (thus named SEIKO 5): 1. Automatic, 2. Water Resistant, 3. Shock Resistant, 4. Date, 5. Day. Please note that some SEIKO 5s actually belong to SEIKO 4, if the “day” function is omitted, the caliber 7S25 is used. The only difference from the commonly found 7S26 is the dropping of the day wheel. SEIKO 5 Sports again issues often use the 7S36 caliber.
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