"30ish" of the T65 notes? Wow!
One thing that might help with authenticity where you have multiple notes is the serial number. Bear in mind, these notes were printed on sheets with several notes per sheet, the number of notes varying with type. Most of the later types would have all the notes on each sheet given the same serial number. What rendered them unique would be the combination of the number and the plate position (often a letter, a pair of letters, a number, or a combination of a letter and number). If you have notes with the same serial number AND the same plate position, they're fake.
Most known old reproductions are listed at
Bogus CSA with many links to images of examples. Sadly, there are people using their computer and printers to make new reproductions. Fortunately, they sell them AS reproductions, but most do not include the word "COPY" as required by the federal Hobby Protection Act. These could turn up some day sold by crooks, or even honest but unknowing heirs. I don't think it's a problem yet. With multiple notes, I doubt any modern faker is changing the serial number or plate position for each note!
As for the books, I do indeed recommend the Fricke "
Field Guide" (2014) mentioned above. The Thian
Register of the Confederate Debt is a must have for the serious collector for helping to identify counterfeits, but as it's a copy of a book that predates modern collector nomenclature, it takes some experience to use efficiently. As Polloco says, it's "incomplete," but most of the missing information is on the last issues, and most of them were not counterfeited. There are also a few errors, but as a whole, it's a valuable resource.
Any serious collector should try and track down a copy of Tremmel's
A Guide Book of Counterfeit Confederate Currency.
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I consider these three to be essential for anyone planning to spend money on this hobby. These books can help save you from making expensive mistakes, and possibly help to find real bargains. I personally don't own a copy of the Derby/McNeil book. It may be helpful and interesting, but I don't consider it essential.