Thanks for photos showing your 1923-to-present version of Great Seal button after cleaning. They show it is has gold gilt (goldplated), so it is an Officer's button. The backmark photo shows what I suspected -- it is "Superior [star] Quality [star]" and is written in late-1800s-to-present non-serifed (plain block) lettering, with three circles of dots. That specific version of Superior Quality backmark is from the first half of the 20th-Century. Since then, most backmarks have gotten "plainer," omitting unnecesssary backmark detail-work like the triple circles of dots.