The C. Grill is considered to be, along with the A Grill, an experimental grill. The National Bank Note Company for a limited period beginning in late 1867 produced stamps with the C. grill. The grill is 16 to 17 points in width by 18 to 21 points in height. Only one denomination was used with the C. Grill, the 3-cent Washington. An estimated 300,000 3-cent Washington stamp with the C. Grill are believed to have been produced.