Thanks to a little diligence and a little luck, I'm able to find some stunning pictures of the stunning model Catherine Roberts, who in the late seventies could be seen in cosmetics ads for both L'Oreal and for the now-defunct Charles of the Ritz brand. This photo is from a 1978 ad from the latter campaign.
With her flawless face and her lovely brunette hair, Ms. Roberts could sell anything, and pretty much did. L'Oreal and Charles of the Ritz were only two of her many clients as a model. To list them all here would take too long. :-)