Hello, I also study and collect Confederate Treasury notes.You are talking a $100.00 note Negros hoeing Cotton center J.C. Calhoun left Columbia right. By chance does your note have a serial letter W or Z?What is the serial number and the signatures for Treasurer and Register? Does the signature you are asking about look like a watermark. Is it J. Whatman.1862?Is it hand dated August 26th 1862?Is it canceled?Can you E-mail me a digital scan?It might not be what you thought but, it could be very rare.