One of several butterfly pins listed on my site, this one was is from David-Andersen, Norway. It is transparent enamel on a guilloche ground of sterling silver with ray-like striations. The color is an electric blue. It is also gold-washed. The body is black enamel. it measures 1 1/4" x 3/4". (please note that 2 others are available - one has a safety clasp and the other has a c-clasp like this one.)
The condition is excellent. The gold-washed sterling silver is tarnished and will be left that way as some buyers like it like that and it takes years to build up such a patina.