Mr. Seymour also lists other people's scanned collections of which the most interesting to the "Blue" International Collector is the Antonius Ra World Collection. Again, emphasis is on the Classic Era. This is still a work in progress so not all countries are represented, but those that have been scanned are well worth a look (including a very impressive US). Here's a page of Roman States from the Antonius Ra collection to give you an idea of the treat in store for the worldwide collector:
I've had it at the back of my mind that when my own collection reaches say 20,000-25,000 stamps, it might be interesting to start scanning my pages. At the rate I'm going that is still some years off. Alternatively, I could scan pages when an individual country is complete. I do have several of those already.
ADDITION: I just found "...Dr. Cheng Chang’s web site of world stamp collection by country. Dr. Cheng Chang intends to collect over 90% of the world’s stamps from 1840, the world’s first stamp, up to and around 1990, though collections from many countries, such as China, Canada, Germany and so on, are up to year of 2000 or even over." Although Dr. Chang appears to have some Internationals, the great majority of his collection is housed in Scott Specialty albums. Absolutely worth taking a look. I think you will be impressed.