Your opinion please!

Two weeks ago I bought an old ring binder on ebay. It comprises drawings of different garments and samples of patterns and pattern pieces, handmade in paper and then adhered to the pages of the book.


They had it listed as a 1950s patternmaker book, but I'm not sure if the book is really from the 1950s. The drawings of the garments look like they were from the 1940s and not from the 1950s
.
 What do you think?
 It's the book from the 1940s or more likely from the 1950s?
I really would like to hear your opinion about the book.

More pictures of the book and a little bit more information about it can be found on my blog.