4 inches tall
These wind ups pack a lot of style into their tiny frames. From the ample litho to the funky paddle wheels, and remain popular among collectors. The silver version is more common than the blue, which is in turn more common than both a blue and silver polka-dotted version. (Which is cooler than it sounds...)
The silver version of this toy has been reproduced in massive numbers. Look for both the triangular key or the "Japan" mark to determine whether it's original or not.