I am selling a Yamaha full double horn, model YHR-661. The key is B♭. This is Yamaha's first professional model and was their top-of-the-line instrument at the time. Regarding its condition, the tuning slides are not stuck, and the rotary valves function without issue. I could not see any detached solder joints. However, although I didn't find any specific problems, I recommend having a repair technician inspect it once. As a side note, current Yamaha horns are restricted by JIS standards, making it difficult to use a wide variety of steel materials. However, it seems that during the time this horn was manufactured, the regulations were more relaxed, allowing for greater freedom in material selection. Because of this, Yamaha horns from this era are prone to red rust. Unlike current models, they used materials with a higher copper content, resulting in a darker and more pleasing sound compared to modern Yamahas. While it's not in mint condition, I must apologize, but due to the recent increase in fraudulent exchanges, I am generally selling this item as-is, with no returns or exchanges. Thank you for your understanding.