illustrated Medieval Alphabet Chart

I have a number of questions about This original piece of art designed for a Church Missal. If anyone has any information regarding it's age and origin please feel free to comment. Based on my research I've come to this Conclusion:

Medieval Original Alphabet Chart

Early 20th Century,One of kind hand Drawn Original Medieval Alphabet chart designed for a Missal. Each Initial letter is uniquely designed. Original Pencil illustration of old farmland on back.

Condition (Excellent)
12"½ X 16"½ Antique Glass Frame
8"1/2X 10"½ illustration