The smaller disc at the right bottom is a CD 1170 L Electro Verre and is the smallest of the known French discs, measuing in at 5-1/4" in diameter and 3/4" thick at the outer rings. Color is much more yellow green than in the pic.. A detailed account of its application can be found in the June 2006 Crown Jewels magazine, or at this link: http://www.cjow.com/archive/article.php?month=6&a=06Foreign%20Insulators.htm&year=2006

----LARGE DISC IS SOLD----