25.9mm Diameter x 6.1mm Center Thickness. Not Sure, Staff & Hairspring Seem Good, But Balance Does Not Swing Freely. This movement has not been checked for duration or accuracy, even if it is described as "running".This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Parts, Tools & Guides\Parts\Movements". The seller is "kstar1977" and is located in this country: US. This item can be shipped worldwide.