Note: As a deaf person from America, I am still practicing!

Correction: F should be like “sit” and C should be one hand, index finger and thumb forming a C. (Thanks for help from others!)

Two manual alphabets presented here: American Two Handed Manual Alphabet and British Manual Alphabet.

Some of the Appalachian Mountains deaf community used American Two Handed Manual Alphabet in the early period up to the ‘60’s. Some Virginia Deaf School students recalled using it for leisure purposes only in the later period.

Link
Deaf History Researcher