I've had one CB-700 piece to analyze and the results say Brass (CuZn36). That one was Tosco made and this fits with other information that Tosco made most if not all of the CB-700 cymbals. Tosco might not have made all of the CB-700 cymbals, and some might be B8 alloy. In Italian Vintage Drums and Cymbals (p124) Luca Lucaino states of Tosco
"The economic line was Solaris in B8 alloy".
although it appears some are Brass. But until we get more samples and info this is what we have.
http://www.cymbal.wiki/wiki/Alloys#Brass
Italian does not equal UFIP, and UFIP does not equal Rotocast despite what eBay sellers continue to claim. Tosco was always a separate company and never used Rotocasting. Atlas does appear on the UFIP stencil brand list but CB-700 does not. There is more evidence than that for CB-700 being Tosco produced based on cymbals which have both the Tosco Solaris trademark and the CB-700 trademark. See the attached images.
And yes manufacturers in metric countries often use a setting of 50 cm on their edge trimming machine as the closest equivalent to 20 inches. See the diameter ink on that Tosco Solaris: 20" cm 50
Because of the number of countries involved (Turkey, China, Italy for a start) being undersized doesn't tell you manufacturer or country all on its own. Edge trimming is approximate and done early in the production process, so 19.5" is close enough in a finished cymbal once it has been through the rest of the production steps.