Vintage Sterling Silver Cube factory ESPO Earrings

Great pair of circa 1975 earrings, very modern in their design. When worn, these earrings give the appearance of being perfect 1/2" cube, but in actuality, they are not. They are marked ESPO and Sterling. ESPO stands for the Providence, Rhode Island company Esposito Jewelry, around since 1951. They weigh a substantial 21.7 factory grams and are in excellent condition. They measure 1" wide and long.