Rare Margot de Taxco Sky Blue Enamel Earrings

Vintage solid 925 sterling silver earrings that are mid-century in vintage.
They were made by Margot Van Voorhies Carr, AKA Margot De Taxco. This pair has a number 16 eagle stamp and the stamp is the early style that was used 1948 to 1952 approximately.
Fully hallmarked on the back though "Margot" is partially cut off the edge.  Style 5403.
Screw back stye and the screws work great. The design is Modernistic swirls that have guillouche enamel in sky blue.
They measure 15 mm x 10 mm and together they weigh 5.8 grams. 
Silver has tarnish from age and I would not think of polishing them and disturbing the patina.