The product is an Armstrong's No 9 Clear Glass Insulator, made in the United States. It features a circle A marking and is marked 7  50.  With dimensions of 3 3/8" high and 2 1/4" wide, this collectible glass insulator is a unique piece for collectors of vintage glassware and insulators. Made in the USA, this clear glass insulator exudes quality craftsmanship and historical charm.