I have a copy of the 1940 Hymnal. My mother used it when she sang soprano in the choir at St. John's Episcopal in Franklin, Mass. It sits next to my BCP and the rest of the music I have in my stall in the choir at St. Helena's in Burr Ridge, where I sing tenor. Sometimes I open it up and look at her signature inside the front cover. Her handwriting then was like engraving - she has Parkinson's now and can barely write.
I will be offering prayers for your mother tonight as I hit the pillow.
Bless you for being a good son.