SST. Sign is Maker Marked Donaldson Art Sign Co., Covington, Kentucky. An outstanding New Old Stock example of this sign from Dry Valley Coal. Sign shows embossed lettering throughout the field with bright colors. CONDITION: Sign is in excellent condition throughout, showing excellent color & gloss throughout the field showing practically no wear in the inner field. The outer edge shows some very minimal wear but overall near impossible to improve upon and an excellent example. Condition: (9.0+). Dimensions: 20" X 9".