Does anyone know how late Sunoco used this logo?

I recently bought some undated Sunoco paperwork using this logo, and advertising "Sunoco, The Distilled Oil". Just trying to figure out a rough date. I assume the mid-20's, but wonder if anyone has anything more definitive.

This sign isn't mine...I did a google search to find an example.

sun_oils.jpeg

Alan
Collecting MN and Minneapolis gas and oil related items