Diameter: Approximately 3.3cm. This is a Seiko School Time hand-wound men's watch for sale ☺︎ It's a simple, timeless mechanical antique watch. There may be minor scratches and clear marks from use and storage, but the glass and dial are clean, and as you can see, it's in good condition. Please examine the images carefully (there is reflection from fluorescent lights). The strap has been replaced with a non-original strap that looks appropriate, but it's a used leather strap, so please consider it as an extra and not part of the evaluation. As this is a used hand-wound watch, I cannot guarantee future operation, but it doesn't stop immediately after winding with the hand-winding screw (crown)... The time was keeping well without major errors, and I was using it normally. Quick change is currently working fine. ※ I have not performed any adjustments such as an overhaul. There are no accessories. I am very sorry, but please absolutely do not purchase this if you are not accustomed to used items, are overly sensitive, do not understand the above explanation, or are feeling anxious. Mercari is a place for private transactions. This is a used item in its current condition and is inspected by an amateur (there is no 100% guarantee... the condition in the images is everything), so please understand. Perfect for an introduction to antique watches... It's a Seiko Mechanical School Time. Feel free to wear it casually... #Seiko #SEIKO #SeikoSchoolTime #SEIKOSCHOOLTIME #SCHOOLTIME #SeikoHandWoundWatch #HandWoundWatch #MechanicalWatch #SeikoTomony #Tomony #SeikoMechanical Movement: Hand-wound