I think there is a better chance this can is 20's. Here is a 1925 add with the sunburst logo. It's tough to come across these sunburst cans in good shape. Cool find!
I tried to find the ebay posting Benjamin talked about, but couldn't find it.

1925-3 (2).JPG 1925-3 (3).JPG
Steve Coppens
Always interested in Sunoco items!
Really want a Sunoco National pump ad glass!!