Mechanical watches will often slow down or speed up depending on orientation. So a watch left face down overnight may keep different time than if left face up etc, or worn continuously. Lease also remember that mechanical watches are not designed to keep time as accurately as a modern quartz - even a brand new Seiko 7S26 from the factory is only specified for ±20-30 seconds per day.
Vintage watches require servicing from time to time. I don't know when this watch was last serviced and while vintage Seikos often happily run for decades, it may also require attention well before then. No box or papers included. The item "Seiko 7009-8009 Black Brown Dial Excellent Original Condition" is in sale since Friday, January 31, 2020. This item is in the category "Jewellery & Watches\Watches, Parts & Accessories\Wristwatches". The seller is "tmbyfc" and is located in Hove.This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia, New Zealand, Egypt, Reunion, South africa.