USA - Breweries

The National Brewing Company was a beer brewing company based in Baltimore, Maryland. The National Brewing Company operated from 1872 until the late 1970s. At the end of the 1970s, the National Brewing Company was purchased and their breweries were shut down. However, National's two most prominent brands, National Bohemian Beer and Colt 45, were kept alive and are now brewed by the Pabst Brewing Company.
Some of the Brewery's Range
National Bohemian Beer - The brewerys flagship beer, first brewed in 1885
Colt 45 - Introduced in 1963

Over the years the brand identity is updated and re-launched with subtle changes, a change of Logo or a new font.
Sometimes this brand update is done by the new owners after a brewery has been sold, other times just to give the brand a fresh new look on the ever growing market.

Below are some notes to help identify some of these changes and an aid to reference the year of the glass.