Floortrader, what a stunning collection of the Spanish colonies you've put together. I'm working on a Big Blue Vol 1 myself and have a handful of Aguera stamps from a feeder album, but don't see myself filling the larger holes for some time!
Especially with Cape Juby - those might take awhile. To your point, I still can't understand why Scott hasn't updated the values for these and other Spanish colony issues - but that's another topic for another day.
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Should put up more Cape Juby because it is the hardest country to complete in the Big Blue series of 1840 -1940 Scott Internationals . There are single stamps like U.S.#2 and the Syrian error but from the Washington Post article the Cape page was the hardest country .
Funny you should say that - in the past month I've acquired both of those singles! (US 2 was from a larger lot and I was chagrined to realize that the 1947 edition of the album, which I have, doesn't actually have a space for this one, but the 60s and later editions do.)