Hello again. I'm not trying to run down your aunt's collection, but a lot of collectors would begin collecting and never get seriously involved, maybe picking up some packets of the common stamps of the time.Looking at this realistically, 1,100 stamps in an album that holds upward of 50,000 (I have a copy of the 1958 edition, here, and it holds 58,000 stamps) is not evidence of a serious collector likely having spent any significant sum on building a collection and in buying more worth-while items.
If the book is in nice condition and the pages are clean and the collection has not been remaindered, the album in itself could be worth more to someone than its contents, the contents being an added bonus and selling point.
Go to
ebay and do a search on "Master Global" and see what is listed and how it is doing. Take a look at "completed listings" to see how the albums have fared recently. Save a search for "Master Global" and you will get an email every time one is listed. Study the listings, save them in "items I'm watching," and see how they do.
The fact is that if someone didn't spend good money buying good stamps, you can't expect the collection to be worth good money, now.