vintage bicycle girl brooch w/ rhinestone bonnet and faux pearl head (gold tone)

This jaunty high-wheel bicycling lady pin belonged to a friend of my grandmother's who had a fantastic midcentury costume jewelry collection (she was a former model.) I love her dainty bonnet full of tiny rhinestones and the sense of motion in this design. I've never seen another brooch like this! All rhinestones appear intact; I'm assuming the pearl is faux. There is no maker's mark. Brooch is 1 inch wide by about 1.25 inches high; pin back does not have a clasp. I'd guess this piece was from the late 1950s - early 1960s based on the rest of her collection, but I cannot be sure. (If you know more about it, please leave me a comment or send a message!)