In addition to being a new discovery, this is the only button we recall designed in blue and purple. 1.25" no maker name and no backpaper likely as issued. Likely 1939 and a promotional tie-in for her movie The Little Princess. Movie pressbooks of the era often suggested contests that local theater owners could use to boost attendance. We suspect that as the origin and/or concept behind this. N. Mint, displays Mint. Rare and first we've seen.