USA - Breweries

Shipyard Brewing Company is a brewery in Portland, Maine, USA, it was founded in 1994. Shipyard is partners with the Sea Dog Brewing Company and Casco Bay Brewing Company. They also produce beer under contract for Gritty McDuff's Brewing Company and brews an American version of Old Thumper under license from Ringwood Brewery.
Some of the Brewery's Range
Shipyard Export Ale - The flagship brand first brewed in June 1992
Old Thumper - First brewed in June 1992
Chamberlain Pale Ale -First brewed in April 1995
Monkey Fist IPA - First brewed in February 2012

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.