Very nice display. A little info as per the book;
The bar logo Sinclair gasoline sign is probably from 1920-1926. There is also a Sinclair Oils, probably same time frame. The Aircraft was in at least three versions, the open cockpit being the earliest known, then the green version, 1926-1928, followed by the red version, 1928-1931. The Sinclair HC was about 1927-1958. The trapazoidal shaped sign was from around 1958 to present. Then the odd stuff, the bar logo HC was 1926-1927. Anyone have an extra laying around? The Tripple check was around 1956-1958. Then there was the Rooster Signs, Productoes Gasolina from south of the border. Several are on my list and will be for a long time.
US Air Force Retired, 1981-2007