Hi,
I have a book called “Painted German Spelter Banks , and a few others, by Bob and Shirley Peirce and your bunny is shown on page 142 listed as number 453 in the book and has a name of Rabbit Sitting up with a size of 4 1/2 inches tall. The rating on your bank is E which means Rare.

This book can be purchased through the Still Bank Collector’s club here: http://www.stillbankclub.com/

There is no listed values in this book but it mentions that the values of these type of banks has been rising and depends on the amount of paint on the bank and condition.

Hope that helps.
Gary