Is this WWII

[scortch]

I found this button in an old park and have no clue as to what military branch it came from and about what time. Is the fact that it is #1 significant? I have recovered indians and barbers from the same area dating from the 1890's into the turn of the century. Any help would be appriciated, thanks in advance.

 

[Bigcypresshunter]

WWI collar disc?

 

[Bigcypresshunter]

They made so many different screwback collar discs but I believe yours is a WWI Idaho National Guard. Nice find. http://www.worthpoint.com/worthopedia/1920s-em-collar-disc-us-ida-1-idaho

 

[scortch]

Wow spot on bigcypresshunter! Thanks so much for the identification.