![Third time lucky: A Seiko 6138-8020 Panda from September 1975 | Adventures in Amateur Watch Fettling Third time lucky: A Seiko 6138-8020 Panda from September 1975 | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2019/03/calendar-plate.jpg)
Third time lucky: A Seiko 6138-8020 Panda from September 1975 | Adventures in Amateur Watch Fettling
![Seiko. A Stainless Steel Automatic Calendar Chronograph Bracelet Watch, Ref.6138-8020, No.551132 - Bonhams Seiko. A Stainless Steel Automatic Calendar Chronograph Bracelet Watch, Ref.6138-8020, No.551132 - Bonhams](https://images3.bonhams.com/image?src=Images/live/2020-08/06/24979231-66-1.jpg)
Seiko. A Stainless Steel Automatic Calendar Chronograph Bracelet Watch, Ref.6138-8020, No.551132 - Bonhams
![Third time lucky: A Seiko 6138-8020 Panda from September 1975 | Adventures in Amateur Watch Fettling Third time lucky: A Seiko 6138-8020 Panda from September 1975 | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2019/03/6138-setting-parts.jpg)
Third time lucky: A Seiko 6138-8020 Panda from September 1975 | Adventures in Amateur Watch Fettling
![Third time lucky: A Seiko 6138-8020 Panda from September 1975 | Adventures in Amateur Watch Fettling Third time lucky: A Seiko 6138-8020 Panda from September 1975 | Adventures in Amateur Watch Fettling](https://adventuresinamateurwatchfettling.files.wordpress.com/2019/03/seiko-catalogue-6138.jpg?w=584)