DSP. An outstanding example of this Circa 1930's Porcelain Stop Your Motor Please No Smoking Porcelain Sign used by Shell Oil Company. CONDITION: Sign is in overall outstanding condition throughout showing excellent color & gloss on each side with no chipping in the inner or outer fields of each side. Each side shows only a few minor nicks along the outer edge and the upper flanged portion is also in excellent condition showing only minimal wear. A tough to upgrade example and an excellent condition piece of early Service Station Signage. Condition: (9.0+). Dimensions: 36" X 6".