This is a Citizen Cosmotron electronic balance wheel watch released in the 1970s. The power source for the electronic balance wheel is a battery, which drives the balance wheel instead of a mainspring, a groundbreaking feature at the time. The case size is large, and it is a masterpiece with a solid build. The top of the crown has the CTZ刻印 (engraving). The second hand can be reset to the 0 position with the button on the lower left. Time adjustment method: Turn-push type You can adjust the date by holding the watch vertically and pressing the crown. You can adjust the day of the week by holding the watch upside down (rotate the watch body 180 degrees) and pressing the crown. The days of the week are available in English and Japanese. Please note that the date may not advance when the watch is placed flat, but this is not a malfunction; it simply requires pressing the crown in the above-mentioned holding positions to adjust. Size: 37 x 40 mm, Thickness: 12mm A stainless steel band is attached. Wrist size: Approximately 19cm The current daily rate is operating at approximately ±1 minute when placed flat. It is operating within the accuracy described, but the overhaul history is unknown, so please consider this as a guideline. Also, as it is an old item, there may be accuracy errors depending on the environment, position, and temperature after purchase. Regarding accuracy after arrival, please accept an error of ±5 minutes as acceptable. Please understand that this is a purchase based on the premise of maintenance. Regarding the condition, there may be omissions in the description, so please comment if there are any areas of concern. Appearance: There are slight scratches on the crystal and case, but it is in relatively good condition for an old item. It is working, but there is no guarantee of battery life. Notes regarding the shipping of watches and small items: Shipping costs will be covered by us only for shipping via Yamato's Nekopos. However, we cannot provide any guarantee for loss or damage of the package. The compensation for loss in the case of Nekopos is 3,000 yen. There is no further guarantee. The difference after deducting the compensation will not be returned. If you wish to avoid any potential loss, we will ship via Kuroneko Yamato or Yu-Pack cash on delivery, with the shipping costs borne by the buyer. If you wish to use the above shipping method, please be sure to inform us before purchasing. We will change the listing and relist it. Changes cannot be made after purchase, so it will be shipped via Nekopos.