I have always enjoyed these swirly purples more than the solid purple Cals. The non-uniformed mixing of the manganese components in the glass batch created some delightful combinations and contrasts of purple and gray in the California glass insulators. Having good dome glass is a given as well as a back-lit display case. These are CD 161's. The left one was acquired after a fierce eBay auction and the other two were purchases from Golden State Insulator Club members.