Thanks to member Robert Brew, here is an article about embossed stamps and how they are cut out. It’s not something new cinderella collectors think about, even though we see it often.
If you go to the Image of the Week Archive Gallery, you can find other combined embossing & die-cut examples; for example November 3, 2023, September 29, 2023 or December 16, 2022.
Die Cuts 2023NovAs Bob notes, this set of stamps is listed in the CSC Event Stamps catalog for 1911, under Paris. There are four colors (red, blue, violet, and green), and 2 colors of a smaller size (violet blue & yellow green). A second design type has similar content in a more horizontal rectangle, and is slightly more difficult, but all are rated Scarce in the catalog.