In the 1900-10s, the St.
Mungo Manufacturing Company out of Glasgow made a series of "Colonel" balls all with different features. This particular colonel ball was made in the 1910s and named the "Heavy Colonel" and featured an usual cover of large, flat dimples with a green dot stamped inside of the name. Another ball in beautiful, gem mint condition.
This ball is middle row left in the group shot in the accompanying images.