I tried to open and close it with a screw-back opener, but it was too stiff to turn. I wish there were other tools that could be used as a substitute... Therefore, I have not been able to confirm the internal details such as the model number and caliber. I observed it for about 3 hours, and it is running according to the time. Long-term operation has not been confirmed. I cannot determine the time error over a day. The price is already at the maximum, so I am not accepting requests or negotiations for a price reduction. Thank you for your understanding. Type: Automatic winding Color: Silver Dial: Silver Size: Case size 3.5cm x 3.5cm Thickness 1cm Lug width: Approximately 1.9cm Specification: Date display Weight: 38.5g Accessories: None OH: We do not perform this service We have a secondhand dealer license and sell items purchased from markets, auctions, and stores. Please rest assured that our brand appraisers carefully check the authenticity of the items with a strict eye. ★ Condition: USED/ 中古 (Used/ 中古) Case: Although not very noticeable, there are some fine scratches and small dents overall. The back cover also has fine scratches and linear scratches. Crystal: There are scratches overall (large to small), and the scratch at the 4 o'clock position is about 3mm and is somewhat noticeable. It can be seen with the naked eye depending on the angle of the light. It is obvious when using a loupe. Hands: There is some deterioration over time (not easily noticeable with the naked eye) To prevent trouble, please refrain from purchasing if you are seeking perfection or are overly sensitive. This item is sold as is, so please understand. If you have any questions, please feel free to contact us. However, I cannot respond to messages late at night. Please also read my profile. #Longines #Longines Watch #LONGINES #Longines Conquest