I agree with my friend Matt on estimated value. Zimmerman was located in three different locations in Michigan from the late 1880's to the 1920's, Birmingham, Owosso and Tecumseh. Then it was sold to Hillerich & Bradsby Co. Great logos and good looking bats over the years and seldom seen today in good condition. Here is a link to a website that will give you a complete history of the company,
http://shiawasseehistory.com/zimmerman.html