A rare and very good condition big SEIKO 6138-7000 vintage.
Calculator automatic chronograph (slide rule bezel: to perform several calculations). This Chronograph is one of the most sought after pieces amongst SEIKO enthusiasts. Stainless steel case with scewed back ref # 4D8364.
Oversized: 47 x 44 mm excluding crown.
All functions work as they should, chronograph subdials reset to zero, quickset day-date works properly and timekeeping function is good. And the outer calculator bezel is in excellent shape.
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