Watch tool watch oil AO-3 CZ-X-CTB-061, purchased new in 2021. The box has been opened, but the item is unused. The box will be folded for shipping due to size restrictions. This is CITIZEN watch oil. It was developed as a domestic oil to replace MOEBIUS. It is a medium-viscosity oil that replaces MOEBIUS's Synt-A-V and is used for the wheel train pivots, the back, and the switching mechanism. It is a lubricant used to reduce wear on watch mechanical parts, creating a thin, strong oil film. It has low volatility and does not corrode metal. The higher the frequency of the balance wheel (like the heart of a watch), the more important the oil's performance becomes. ■ Maintains stable performance over a long period. It is stable over a long period because it is resistant to oxidation and does not react. It has excellent viscosity, moisture resistance, and humidity characteristics. It is stable in the range of -40℃ to +80℃. ■ Can be used on materials such as metal and plastic used in watch movements. It can be used on quartz watches and mechanical watches of all materials. ■ Excellent wear resistance to suppress the generation of wear powder. ■ There is no need to worry about performance degradation even if additional oil is added to the existing oil. However, it is recommended to use AO oil alone to achieve the best performance.