1920's ? Laundry Lithograph

I got this on a recent pick and can't find any information on it anywhere. It's marked Lithograph USA Nov 28. I'm assuming that means 1928 but not sure. Hopefully somebody can give me a little more information and maybe a value. I usully sell things I pick but I'm thinking I'm going to keep this for a while since it's so cool. I picked up 7 different ones that all advertise the laundry. The signs are 21 3/4 inches tall and 38 3/4 inches long. Thanks in advance.