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In the 20th Century the city of South Saint Paul was synonymous with stockyards.  Several companies had major meatpacking plants in the southern portion of the city.  Here is a nice Group C meter from one of the big operators in the So. St. Paul meatpacking scene.  

For more information about the different types of US meters (or any meter worldwide) I recommend the following website.
http://en.wikibooks.org/wiki/International_Postage_Meter_Stamp_Catalog
re: South Saint Paul, MN - Group C Meter Imprint
note the addtional 1c paid in the central oval, adding to the fixed 2c in the ring