Why is the eagle upside down on the 1887 silver dollar?

The eagle is depicted upside down on the 1887 silver dollar due to a mistake in the design process. This error occurred when the engraver, Charles E. Barber, created the coin's reverse side, inadvertently flipping the eagle's orientation. As a result, the coin features an eagle facing the opposite direction from its intended position, making it a unique and notable error among collectors.