Pair of Imperial number 6 Decanter with mould blown stopper. The same decanter in crystal, with a different stopper, was part of the "Twist" Glassware line in the early 1950s.
Imperial called the orange color "Bittersweet" and the opaque yellow is called Jonquil. These are hand blown into moulds are were quite expensive to make.
These colors were only made circa 1958/1959. 13.25 tall in very good condition with no damage or stains.
There is some UV reactivity as shown in the photos. Safe, secure and sturdy packaging of glassware always.