Ok heres what I think this is, Circa WWI, sharpshooters badge Dunno maybe you can help me with this one....it has "Shreve & Co." and "Sterling" on the back...thanks for looking-Rob
"It appears that the dated award bars in different metals were not issued until 1891 with the Type 2 badges. The gold "Sharpshooter" for averaging 90% or better, silver "Rifleman" for averaging 80-90%, and bronze Marksman for those averaging 50-80%. These remained unchanged except that the gold bars appears later as the "Expert Rifleman" or "Revolver Expert" and the silver bars appear as "Sharpshooter" or "Revolver 2nd Class" and there is also a bronze "Revolver 3rd Class" Bar. Another bar noted was a silver "First Class Rifleman" 1908."
Type 2 badges (yours)
"The type 2 badge is a 1" diameter silver circlet, whose front design was a 3/4 Bear's head in the center and an inscription around the edge "NATIONAL GUARD OF CALIFORNIA * EUREKA *.On the back was the inscription "AWARDED BY THE STATE TO" with a space for the recipients name and date of award, the rest is plain, except for the badge number. It is known for a fact that these badges were awarded with dated bars: in gold, silver, and bronze. The type 2 badges were awarded until World War I."