What Does Cd Mean (In Regards To Stamp Image Description) ?

I'm doing some work on the international collection and am working on Cape Verde. I have a couple of stamps I'm unsure of, and looked in the Scotts stamp catalog.

Various stamps for Cape Verde indicate the image as "CDxx".

Obviously, I can't find the images anywhere, and of course have no clue as to what the CD refers to...........

Can you help?
Thank you!

CD = "Common Design". Some stamps - mostly the Europa series and issues of various European colonies - were issued by multiple countries with the same design. Instead of picturing the stamps in each country's listing, Scott pictures them once, at the beginning of the catalog. Go to the pages immediately preceeding the first country in each volume and you'll see them there. Scott does this to save ink and space - the overall size of the catalogs is reduced by a few pages or so by them doing it this way.

Yes, I've found it!
Thank you, the old dog learned something new today!!

mobilman: for the Portuguese area, there is more to "CD" than meets the eye. The Portuguese were notoriously frugal in their classic stamp designs. As examples, note the Cabo Verde 1894 designs; called the Carlos Neto after the king and engraver. They're the same for almost all colonies. Same for the Carlos Mouchon series of 1898 to 1903. Then there are the colonial Ceres issues beginning in 1914. All of these issues required at least two passes through the printing press, which has led to some real interesting oddities, misplaced or missing letters & numbers, and outright errors.

Known as "key types" in GB catalogues.

Also keep in mind that if you collect the British area that their watermarks are treated similarly by Scott - they are only shown once per catalog rather than in each country that used them.

As a side note, everyone who owns a Scott Catalogue really should read the entire introduction at some point, as there's a lot of good information in there, about a wealth of topics. And they also explain clearly what catalog prices are based on and how to use the catalog itself. I only wish they had a better stamp identifier in it for those areas that are somewhat off the beaten path and not easily identifiable by your "average" (i.e. non-specialist) collector.

"known as 'key' types........" ; "if you collect the British area.........." Yes indeed, British Commonwealth through 1965; particularly British East Africa through KUT; is a secondary collecting area of mine. Watermarks, perfs (Ascension Island anyone?), even shades are real intriguing.

Couple years ago, I picked up my one and only Gibbons catalog, for KUT et al, so I could figure out the "fly-specking" for the KG V and KG VI pictorial issues.

Yes, I do need to fully read the front pages of my Scott catalog set. There is a lot of info there, and I confess I've put off reading that more than once. Gotta just do it!

Another point.
The "Europa" stamps that have been issued among European nations (mostly) since about 1957
were issued in a "Common Design" for the first twenty or so years. Then they changed to a "Common Theme' for a while and now it seems that they just pull ideas out of the air.