From 1832 to 1951 Manning Bowman used a variety of marks. Below I have tried to list all of the marks and trademarks along with the years in which they were used. (Below scan was provided by Doug Boyd)
The globe and eagle trademark was used from around 1885 to 1902. From 1903 to 1912 Manning Bowman only used the script shown below.
In 1913 Manning Bowman used the mark shown below.
From 1914 to 1923 Manning Bowman used this mark.
Finally from 1924 to when they closed in 1951 Manning Bowman used the square MB Means Best mark shown below
This mark was registered with the U.S. Patent office on May 5th 1924