It absolutely cannot be Mercury (the Roman messenger of the gods), and not even "his girlfriend." Mercury's wings were on his heels (so of course his wings were very small). He is sometimes also shown wearing a winged cap ...hence the term "Mercury dime." One of the major message-services in the US also uses him as its logo.
The what-is-it item is definitely a winged fairy charm, or necklace-pendant. Nude female fairies were quite popular jewelry-art in the USA from the late 1960s through 1980s. Of course, this one could have been manufactured more recently than that.