Shimmery Sterling Silver Butterfly Pin Mexico

Vintage sterling silver butterfly pin that was made in Mexico and is marked with the artist mark MMS. It is heavy and well made. The thin filaments allow this piece to shimmer and shine. It measures 2 1/4" wide by 1 3/8" tall. No movable parts except the pin back and locking clasp. Weight: 15.7 grams. 

Here is is outside in the sun: