This is a wonderful pair of early screwback earrings which are made of sterling silver and hallmarked as such. They were made by LOS BALLESTEROS and are marked with the stylized B along with LOS BALLESTEROS. There is no eagle hallmark which dates this pair to the late 1940's.
The large oval shaped smooth blue stones are gorgeous! Each earring measures 3/4" by 9/16". Condition is VERY GOOD! Need a quick polishing if you so desire!