I wish I had all 26 letters of this letter series to share with you. A two-volume French work did use 13, and I’ve shared all of them with you. (You can find them all here.)
Unfortunately, some of them are only available in a smaller size and this pretty letter M is one of those. The M is decorated with a series of crosses and circles. It shares the spotlight with a lovely flower, a sunflower, I think. Vines, berries and leaves further decorate the letter.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.