The original manufacturer is unknown, but these Empoli style stoppers look very similar to the work of "Diana", or Blenko. I am doubtful they were made by Blenko. Orange colored glass bottle stopper.
Vintage Levay handblown glass art paper weight threaded iridescent Large Rainbow
Vintage Clear Handblown Glass Whale Paperweight Figurine Beach Cottage Art Decor
Vintage Green Handblown Glass Hat ... Planter? NO GLOW
Vintage MCM Handblown Glass Ashtray Cobalt Blue With Controlled Bubbles Pattern
Vintage Orange Coloured Glass Vase 12” Thick Glass 1970's
Vintage Orange Carnival Glass Beaded Dish w/Handle Scalloped Candy Relish
