Congratulations, Anne - it's a little beauty - and this version, in marigold Carnival, is not often seen. In fact it's always a delight to find any Sowerby Carnival with a moulded peacock head trademark on it.
Your piece is known to collectors as "Jewelled Peacock" (named for the exterior design / peacock head mark). The interior is (as noted above) a later addition and is the Sowerby version of Imperial's "Scroll Embossed" (also used on the Diving Dolphins bowls).
Two other exteriors were teamed up with the Scroll Embossed interior on little "sweet" dishes. These often get called "ashtrays" by (mistaken) collectors.
We wrote about these items, and showed a range of colour photos of the piece you have ("Jewelled Peacock") in "A Century of Carnival Glass" (2001) and in "The Art of Carnival Glass" (2004).
Glen