Just a sweet little tin toy windmill, likely from an old model train set. I love the blue and orange color scheme, and the flower-like form of the rotor, In warmer weather might set it on the windowsill or near a fan to set it cheerfully spinning.
Stamped made in Germany on the underside of the gray base. A little light rusting but overall great condition. About 5" tall (I need to double check exact dimensions and will update!)