I do not intend any offense to Smallfoot, but the site at the link he posted is almost useless for dating Scovill button backmarks, due to showing only a few of the many-many variations in the 100+ years that Scovill was making buttons.
That being said... regarding Creskol's button, one photo is useful. The site shows a World War One era "black finish" US Great Seal button, with the Scovill backmark written in "serifed" lettering. Creskol's button has the Scovill backmark written in "plain block" lettering... which means it was manufactured sometime after the end of World War One and the end of World War Two, when Scovill stopped making buttons.
My thanks go to BigCypressHunter for creating the helpful educational graphic below, which shows the difference between serifed and non-serifed lettering. (Serifs are the little prongs and knobs on the ends of a letter's arms.)