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セイコーBusiness Bellに使われるムーブメント

日本名：ビジネスベル

A more refined version of the Bell-matic watches, this had a higher jewel count (27 compared to 17 or 21) but was only produced for about a year around 1967. As with Bell-matics, it has a mechanical alarm powered by a separate mainspring which runs for around 10 seconds.