Baroque Covered Jar, Fenton
This is Fenton's #9368 and first appeared in their 1978 catalog in amethyst Carnival. I've never seen it in another color--so far. This example, with a chip on the finial, sold for $8 on eBay in 2004. I estimate that undamaged examples would bring between $25 and $35 but in 2008 one brought $134 on eBay.