This is for a New Old Stock vintage ca 1970s bumper sticker from Ski-Cal De-Sign (aka Ski-Cal) which reads "Came to Believe" with a black background. I believe this is a Alcoholics Anonymous reference, as many Ski-Cal stickers were AA-themed, and also anti-drug use. 11" x 3".  This is a prism/sort of hologram design, so reflects light with a variety of colors - but it is basically silver.  If the photo shows other colors, it is from light reflection.