This item is a Citizen Seven Star Diver. It is an antique automatic watch. With manual winding function. The crown at the 2 o'clock position is for rotating the inner bezel. It has been overhauled at a watch store this month (February 2023). The original crystal (dead stock) was replaced during the overhaul. The strap is aftermarket. This is a popular Citizen Diver watch both overseas and domestically. The lug width is 20mm, and the case width is 43.39mm. It has been overhauled and its operation has been confirmed, so you can use it immediately (*^^*) Please refrain from purchasing if you are sensitive to scratches or scuffs. This watch looks great with suits and casual wear. Thank you. We have many other items for sale, so please take a look. Also, we do not accept cancellations after purchase, so please be aware of this.