The first Washington DC Little Tavern, located at 814 E Street, NW, opened its doors in 1928. It appears the site is now the home of a twelve story apartment building and a Bank of Georgetown.
Early Little Taverns seem to have had a design similar to that of 1920s White Castles and White Towers.
By 1931, the Tudor Cottage Design had been adopted
In 1937, it was updated with a bit more of a moderne syle
And a later, simplified design. What I’ve found on this one points to a date of construction in 1974
This one was found in Silver Spring, Maryland until relatively recently. When it was torn down, it had been painted yellow and was operating as a Chinese restaurant.