So Foamy, what edition is your moms old Blue book ?
Someone was bound to get a story outta these. LOL.
When Mom was older, I bought this one I have for her, because I knew little about memories but I could see her Blue book she used so much was completely falling apart. Later when Mom pasted, she left me all her recipes and resource books. I found 4 Blue Books. I gave my sister the oldest one, the one in bits and pieces, one to my niece and nephew all of which had memories of Mom's cooking. Wouldn't that be a wonderful legacy?
I am pretty sure mine was the newest of the four, it doesn't have a revision number but it does have a copyright date where it changed publishers, mine is 1995. I know, not new, but the newest of the four and the one I bought her. I know my Mom was using her Blue Book as far back as 1950's and probably as far back as the 30's. I am guessing it might have been a graduation or wedding present, they did stuff like that. She gave me a cookbook when I graduated High School. Betty Crocker. I thought it silly at the time, but I sure wish I still had it, too many moves in life. I carried that cookbook all over the country.
Sorry for the long story, I get that way sometimes........
I am guessing 1995 is the answer.