Here's a really cool unlisted porcelain insulator in the shape of a multipart but its really a unipart! From Spain. Unmarked. Not in the books or NIA website. Very close to a CD 106!

Best of all dead MINT condition! First email that says they want it gets this cool scarce insulator for only $85 plus 11 shipping. The CD 106 CTNE ESA Light Aqua is also available for only $20. Thanks!