Cummins 'Big C' Engine Vintage Coffee Cup Mug Diesel - Large Manly Man Size The Cummins 'Big C' Engine Vintage Coffee Cup Mug is a large and manly sized mug featuring a white color with the theme of gas and oil. This original coffee mug from China is ideal for collectors of advertising memorabilia, especially those interested in the gas and oil industry. The unmarked brand adds to the vintage appeal of this unique piece. Perfect for enjoying a cup of coffee while reminiscing about a bygone era of big engines and diesel power. If you have any questions please feel free to ask.