Sizes are 7/8” to 3.5”. Large button at center for Conoco is a litho from the 1930s. All other buttons are celluloid except at upper right the 1” for “Pan-Am/Gasoline/Motor Oils” is covered in finely woven fabric. At bottom left is a celluloid device with five dials to keep track of mileage for oil changes. Text advertises “Canqol Gasoline” and “Wm. Penn Lubricants.” Some slight loss of the blue color but no serious damage. The buttons are all circa 1930s-1950s. The large litho is Very Fine with pinpoints of wear and the others are NM to Mint.