This is a very uncommon set of collectable bookends by Kronheim and Oldenbusch (K&O) The Collectors Encyclopedia calls these "Dance Pose"
Circa 1932.
The set does not have a KO shop mark I have seen this at three times and all of them were unmarked. They would’ve had a paper label on the bottom, but that was long ago.
Gray metal with bronze finish. Take a good look at the photos for description.
The dancers have great lines and the flowing hair is quite attractive.
The bookends are a 7-1/2 inches tall and 5-1/2 inches wide. The pair weigh 4 pounds 11 ounces.
Condition is excellent. A little bit of age appropriate wear. See photos.