From the auction listing:
The Peacock begins its grand performance in the tail-down position, regally he turns his head and body separately from side-to-side. then he proudly raises his elegant tail plumage and fans his tail out for the fullest effect. The bird then turns side-to-side again, such that all can appreciate his beauty. At the conclusion, he lowers his tail back down in a graceful and realistic manner. All the while, music plays.
The maker is unknown and no other examples of this model are known to exist! The size, age, condition, superb construction, and uniqueness set the estimated value of this automaton between $50,000 and $75,000 USD.
Here is a page with the full description with a video of The Magnificent Peacock automataon.