I went out scouting ghost signs and vintage steel signs yesterday in North Center. I think this is the oldest ghost sign I've found in Chicago. (Irving Park and Wolcott).

My internet research found this info on the company: Fairbank's Gold Dust Washing Powder - The Many Purpose Cleaner. The N. K. Fairbanks Soap Company produced numerous types of soap and cleaning products. The business started in 1897 and eventually folded in the 1930's. The Gold Dust products were represented by the Gold Dust Twins, two African-American children surrounded by gold coins. In fact the twins were one of the best known trademarks of the 19th century. Let the Twins Do Your Work was the tag line.

more pics from this on my flickr page.