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Seiko 6105B
Email from LtCdr in Swedish Armed Forces HQ. Wristwatch was used by Swedish Mine Divers from 1974 to 1984. Simmilar watch was also used in Coast Artillery. In Swedish:-)
Tre Kronor
Images from the cleaning/restauration
 
Seiko 6105 - 8110 With an 6105B automatic hacking movement. With date #531914 Production date: Mar, 1975