I have a Seiko SKX013 which I purchased in 2019. This year I noticed that it was running a bit slower and I sent it to Seiko for a check up and it works fine now. See pictures. Factory specs are: Full reference: SKX013K2 Case material: Stainless Steel Case diameter: 37 mm Lug width: 20 mm Lug-to-lug length: 43 mm Thickness: 13 mm Movement: 7s26 (non-hackable) Power reserve: 41 h Frequency: 21,600 bph Manual wind: None I am looking for £220 and for now just UK sales. I will cover the postage costs. Any questions please PM me. Unfortunately this is the first time I am selling a watch on OF. Thank you to OF!