Reamers are orange juice squeezers.  They were made in dozens of different shapes and colors as well as materials.  There are glass reamers, ceramic, porcelain, china, metal, precious metal and wood reamers; and don't forget plastic.  They were made by many different companies but probably the most well-known is Sunkist.  Sunkist did not make the reamers; they had glass manufacturing companies make the reamers for them so they could give them out to customers, distributors, etc.  This particular reamer was made by Fry Glass.  Fry made extremely beautiful glassware, not just reamers.  The reamers they manufactured came in many different colors, including amber, green, pink and opalescent, as well as many shapes and sizes.  The definitive reference on reamers is And Many More Reamers by Mary Walker.