I read your website article at: http://www.coinbooks.org/esylum_v10n18a15.html and, being the owner of several rare Bashlow 1 cent Confederate restrikes offer the following observations:

Regarding thin flan metals used, I have two, one a in a TOMBAC metal (90% copper, 9% zinc), which would be in Breen's "other metals", and the other in a "Nickel Silver" metal (66% copper, 18% nickel, 16% zinc, 0% silver).

I also have in my collection, Bronze, Silver, Goldine and PLATINUM which are thick flan, measured by NGC as 3.04 mm thick, measuring the edge of the plan and not including any high points of the devices.

I have an Aluminum one, but cannot determine its thickness without removing it from the holder, but I assume it is likely thick flan.

I am looking for the following other metals that are mentioned by Breen: Gold, Tin, Lead, Zinc, Red Fiber and any additional "other metals". Any information on sources for any of them will be most welcome.

I worked with NGC to have metal tests performed on most of my Bashlow cents, including both the common and rare ones. Goldine was found to have 85% copper, 15% zinc, and Silver was 90% AG and 10% CU.