Diameter: Approximately 3.3cm. This is a Seiko Tomony Mechanical (hand-wound) men's watch for sale. As you can see, it's a rare "TOMONY" design that's not often seen. There may be minor scratches, clear scratches, and slight dirt from use and storage, including on the glass surface, but as you can see, it's in a reasonably clean condition. Please examine the images carefully (there are reflections from fluorescent lights). The belt has been replaced with a new, non-original leather belt that looks natural. This is a used hand-wound watch, so I cannot guarantee future operation, but it is running without major errors. Also, it winds properly with the hand-winding screw (crown) and doesn't stop immediately... *I have not performed any maintenance such as an overhaul... so please understand that the condition may change in the future... It's an old antique watch, so I think it would be stylish and fun if you could use it with an open mind^^; There are no accessories. I am very sorry, but please absolutely, absolutely, absolutely do not purchase this if you are not used to used items, are overly sensitive, do not understand the meaning of the words or the above explanation, or have any concerns. Mercari is a place for private sales. It 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. It's a classic Seiko Tomony antique watch☺︎ How about adding it to your proud collection...? #Seiko #SEIKO #SeikoSchoolTime #SEIKOSCHOOLTIME #SCHOOLTIME #SeikoHandWoundWatch #HandWoundWatch #MechanicalWatch #SeikoTomony #Tomony #SeikoMechanical Movement: Hand-wound