Sinn EZM4 I have kept this as part of my collection. I purchased it on an auction site, and bought it as an unused item from the previous owner. Since it has come into my possession, I don't think the movement has been running for even an hour, and I haven't even tried it on. I am a novice when it comes to movements, so I don't know much about them. I was satisfied with the purchase, so I put it in a storage shelf and have kept it carefully without taking it out of the box. Therefore, I don't look at it at all. ⭐︎I wound the mainspring now, but it doesn't move, and it needs maintenance. The scratch-prevention sticker is still attached to the buckle. With a guarantee card. The outer box has a signature from Sinn's president, who signed it when he visited Japan. The inner box shows signs of aging. Please refrain from purchasing if you are sensitive to details. No claims, no returns. This is a high-value item, so please comment before purchasing. Please ask if you have any questions. Also, returns after purchase are not possible under any circumstances to prevent switching, etc. Please understand everything before purchasing.