What is noted as a Type 6 in Delande stands for a Type 4, and is in fact a "Présidence" model.
This confusion between the type 4 and the Présidence model has been made by Bourdier in 1927 in his book :
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His daughter Colette Bourdier, in a reprint of the book of 1977 corrected it by stating the two crosses of Knight and Officer were in fact from the "Présidence" period, and not from the First Empire.
The Bourdier's book, like the Delande's are based on one of the most extended collection known is the 20's which was the famous "collection Brouwet". This collection is today in the Royal Army Museum of Brussels.
I recommend, in addition of "L'Insigne de l'Honneur" quoted several times above, and for those who are really interested in the Légion d'honneur, to get "Les Distinctions Honorifiques de La Collection Brouwet" from Guy Deploige, edited in 2006 by the Royal Army Museum of Brussels. Guy Deploige and the Museum have made a huge study and precise examination of this collection and have rectified the mistakes made previously.
Below is a highlight of this book describing a mere Type 4 of the First Empire:
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Edited by Bison, 11 March 2012 - 09:02 .