This is a vintage cobalt blue glass mug with a cut or etched and frosted seashells design on the front. It is a souvenir of Naples, FL. The mug is marked Made in USA on the base. It is 3 3/8" wide and 3 5/8" tall. The mug is in excellent condition with no chips or cracks.
Naples, FL Cobalt Blue Souvenir Cut Glass Seashell Mug