This is a very lovely and collectible pin. It depicts a little cherub, a winged angel aiming with his bow, perhaps Cupid?
The little fellow is surrounded by ribbon and foliage. On the ribbon it has the inscription "SAGITTARIUS", so it's for someone born in the winter.
The pin is marked "Sterling by Cini" to the back, it measures 1-3/8" long by 1 -/8" wide and weight 8.5g.
In excellent vintage condition.