Works as it should, service history unknown. Its automatically winding watch: you need to wear (or gently shake) it for a while to wind it. Second hand is a chronometer hand and not a time related second hand. If you intend to keep it running make sure the watch is fully winded: chronometer "eats" a good reserve of the winding.
I advise to go to youtube: there are videos on how to operate this model. Bracelet in fair condition and fit 7 1/4 wrist. Please watch my You Tube channel EBAYER. Please like/hate, share and subscribe. LET'S BE GOOD EBAYERS!The item "Seiko Chronograph 6139 6002 Automatic 1970s Vintage Japanese Sports Watch. Box" is in sale since Tuesday, April 23, 2019. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Watches\Wristwatches". The seller is "sashastudiosnyc" and is located in New York, New York. This item can be shipped to United States, Canada, United Kingdom, China, Mexico, Germany, Japan, France, Australia, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Greece, Portugal, Cyprus, Slovenia, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Austria, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Bangladesh, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Nicaragua, Pakistan, Paraguay, Uruguay, South africa, Colombia, Barbados, Bermuda, Cayman islands, Sri lanka, Maldives, Oman, Reunion, Philippines, Ukraine.